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Check

Check may refer to:

Everyday uses

Financial instrument

A check, known as a in and other countries, is a negotiable consisting of a written order from the drawer (the account holder) directing their (the drawee) to pay a specified sum of from the drawer's account to the named payee or, in some cases, to the bearer. This serves as a secure method for transferring funds without the need to carry , relying on the banking system's and clearing processes to ensure payment. The origins of the check trace back to the in , where the term derives from the sense of , akin to checking off items on , with roots in the chess term for threatening the king, entering English via Old French "eschec" around the . Although precursors like bills of exchange existed earlier in medieval for , the check evolved as a standardized banking tool during this period, with printed forms emerging around and widespread adoption by the late 1700s to facilitate domestic and international payments amid restrictions on banknotes. By the , checks had become integral to commercial banking, particularly in the United States following the establishment of institutions like the of in 1784. Essential components of a check include the of issuance, which determines its validity and processing timeline; the payee's name, specifying the recipient; the payment amount expressed in both numeric (e.g., $100.00) and written (e.g., one hundred dollars) forms to minimize risks; the drawer's for ; and bank-specific details such as the routing number, account number, and the bank's name and location, often encoded in magnetic ink for automated reading. These elements ensure the instrument's legal enforceability under the in the and similar regulations elsewhere. By 2025, check usage has sharply declined due to the proliferation of electronic alternatives like transfers, debit cards, and digital wallets, which offer faster and more convenient processing. The Payments Study reports that total check payments in the dropped from approximately 42 billion in 2000 to 14.0 billion in 2018 and further to 11.2 billion in 2021, reflecting an average annual decline of 7.2% in the latter period, a trend continuing amid ongoing .

Verification symbol

The check mark, typically rendered as ✓, serves as a graphical symbol denoting affirmation, verification, or selection in various contexts. This symbol, also known as a or , features a V-shaped stroke with an extension forming a short tail, creating a resemblance to a bird's foot or the footprint of a (a type of crow). Variants include the simpler V form or more angular styles used in handwriting and digital interfaces. In , it is standardized as U+2713 , part of the Dingbats block, facilitating consistent representation across computing platforms. Historically, check marks trace back to ancient writing on Babylonian tablets from the second millennium BCE, where small wedge-shaped indentations marked completed tallies or verified entries in administrative records, aiding in and . This practice evolved into modern usage during the , particularly in auditing and , where tick marks denoted procedures performed or items confirmed without lengthy explanations. While popular accounts link the V shape to Roman abbreviations like "verum" (truth) or "" (victory) for endorsing documents, primary evidence for this etymology remains limited, with the symbol's widespread adoption tied to practical needs in checklists and ledgers by the 1800s. In everyday applications, the check mark appears on graded papers to signify correct answers, in to-do lists to track completed tasks, and in quality control processes to confirm inspected items meet standards. For instance, auditors use abbreviated tick variants (e.g., √ or ∨) next to financial figures to indicate verification steps like addition checks or reconciliations. In user interfaces, it manifests as checkboxes—interactive elements allowing multiple selections—prevalent in forms, settings menus, and e-commerce for options like shipping preferences. Cultural interpretations vary regionally; in some East Asian contexts, such as , a check mark-like stroke may highlight errors for review (e.g., in , prompting students to "check again"), while a filled circle denotes correctness, inverting Western conventions. By 2025, the symbol's role in digital accessibility has been formalized under (WCAG) 2.2, requiring checkboxes to have programmatically associated labels, sufficient color contrast (at least 3:1 for non-text elements), and keyboard-navigable states to ensure usability for users and those with motor impairments. Psychologically, the evokes positivity and a sense of completion, as studies show it symbolically associates with "good" outcomes, enhancing judgments of quality and satisfaction compared to negative symbols like X. Cognitive research links marking tasks complete—via checklists—with release, fostering and reduced anxiety through perceived progress, particularly in goal-oriented activities.

Deferral promise

The term "rain check" originated in the 1880s as an Americanism in , where spectators who had paid admission to outdoor games interrupted by received vouchers or tickets redeemable for future matches. This practice addressed the financial loss for fans attending open-air stadium events, with the first recorded uses appearing in print around 1884. In contemporary usage, "rain check" has evolved into an idiomatic expression signifying a polite deferral of an offer or to a later time, particularly when immediate fulfillment is not possible due to circumstances like unavailability. It commonly applies to social engagements, such as postponing a , or commercial scenarios, like requesting to claim a price on an item after stock replenishment. Unlike a formal , which implies a repayment, or a simple postponement, a rain check emphasizes courteous and intent to honor the original terms without obligation. Representative examples include retail promotions where customers receive rain checks for sold-out sale items, allowing purchase at the discounted price once restocked; job interviews deferred due to scheduling conflicts, with the phrase signaling continued interest; and event tickets for rescheduled concerts or games. In one instance, a grocery chain like issues such checks for advertised reduced-price items unavailable at the time of visit. Similarly, a rain check might briefly apply to restaurant reservations canceled due to overbooking, promising priority access for a future date. By 2025, the concept has adapted to digital platforms, where waitlists and notifications function as rain checks for out-of-stock products or events, notifying users when availability resumes. These tools, such as those integrated into platforms like Waitwhile or NextMe, enable automated deferrals for promotions and online gatherings, maintaining the idiom's spirit of deferred fulfillment in a tech-driven economy.

Restaurant bill

In , a check refers to the itemized presented to diners at the conclusion of a , detailing the , beverages, applicable taxes, and any or fees owed. This document serves as a record of the , allowing customers to verify charges before . In contrast, British English predominantly uses the term "bill" for the same purpose. The term "check" derives from the historical practice of "checking" or tallying accounts in , evolving from markers used to verify items against a in early settings. Typical components of a restaurant include the establishment's name and information, the and number, an itemized list of ordered items with individual prices, subtotals, , any automatic for large parties, the final total, and options for payment methods such as , , or digital wallets. In the United States, restaurants are legally required to ensure the accuracy of these invoices to comply with laws and tax regulations, with inaccuracies potentially leading to disputes, refunds, or penalties under frameworks like state unfair practices acts. Culturally, in the , it is common for groups of diners to split the check evenly or by individual orders to share costs fairly, a practice that requires servers to divide items across multiple payments and often influences decisions. customs remain a key aspect, with the standard at full-service restaurants set at 15-20% of the pre-tax subtotal as of 2025, though surveys indicate that about 34% of patrons now tip 20% or more amid ongoing debates over service expectations. By 2025, the restaurant industry has seen a significant shift toward billing, with table-side tablets enabling servers to process payments, split checks, and collect tips directly at the table, while app-based systems and menus allow customers to view and settle invoices via mobile devices, reducing reliance on paper and speeding up turnover by up to 20%.

Travel luggage

Checked baggage refers to passenger luggage that is handed over to an airline at the check-in counter, tagged with a unique identifier, and transported in the cargo hold of the aircraft, separate from carry-on items accessible during the flight. This process allows for larger and heavier items than carry-on allowances, with the airline assuming responsibility for handling and secure transport. Baggage tags, often featuring a verification symbol such as a check mark for confirmation, ensure accurate matching to the passenger. Standard procedures for include adherence to weight and size limits set by , typically up to 50 pounds (23 ) per bag for most carriers in 2025, with dimensions not exceeding 62 linear inches ( + width + ). Exceeding these limits incurs fees, often starting at $100 for or additional bags, varying by route and policy. All checked bags undergo screening, such as or systems, to identify threats before loading. Following the September 11, 2001 attacks, handling was standardized with mandatory passenger-baggage matching to enhance , leading to widespread adoption of RFID tags for improved tracking and reduced mishandling rates. This shift addressed vulnerabilities in pre-9/11 systems, where unaccompanied bags posed risks, and RFID technology now enables real-time location monitoring across airport networks. Airlines face risks including loss, damage, or delay of checked baggage, governed by international rules like the Warsaw Convention, which originally capped liability at approximately 17 SDR (Special Drawing Rights) per kilogram for international flights, though many carriers now adhere to higher limits under the updated Montreal Convention. Prohibited items in checked baggage include firearms, explosives, flammable liquids, and certain sharp objects, as enforced by agencies like the TSA to prevent security hazards. For lost baggage, compensation protocols require passengers to file a Property Irregularity Report (PIR) immediately upon discovery, with airlines obligated to search for up to 21 days and provide reimbursement up to $4,700 per passenger for domestic U.S. flights under DOT regulations. In 2025, advancements include widespread biometric systems, with 50% of passengers using facial recognition or fingerprints for faster bag drop and verification at major airports. Sustainability efforts focus on reducing plastic waste in tags through RFID-enabled and alternatives, as seen in partnerships like ' migration to eco-friendly labeling across its network.

Games and recreation

Under the official Laws of Chess effective from 1 January 2023, is defined as being "in check" if attacked by an opponent's or , and no move may expose or leave in check (Article 3.9). To resolve check, the player must make a legal move that either relocates to an unattacked square, captures the attacking (if unprotected), or interposes another between and the attacker (applicable only to ranged attacks like those from , rooks, or bishops). Check functions as the immediate precursor to checkmate, the game's winning condition, where the king remains in check with no viable escape, legal capture, or blocking option available, thereby ending the contest in favor of the attacker (FIDE Article 1.4.1). Tactically, delivering check forces the opponent into a defensive response, often gaining tempo or exposing vulnerabilities for further attacks. Checks are integral to many tactical motifs, such as the discovered check, where moving one piece reveals an attack from another on the king, or double check, where two pieces simultaneously attack the king, typically requiring the king to move. For example, in a discovered check, a bishop might be uncovered by a pawn's capture, attacking the king along a diagonal. Another common use is check as part of a fork, where one piece attacks the king and another valuable piece simultaneously. These tactics are prevalent in openings and middlegames; a basic illustration is Fool's Mate, the shortest checkmate in two moves: 1. f3 e5 2. g4 Qh4#, demonstrating early king exposure. While focused on standard international rules under as of 2025, the check mechanic appears in variants like three-check chess, where players win by delivering check three times before achieving . In contrast, the board game uses a checkered board pattern but lacks any concept of check or king threats.

Board game

The name "," used primarily in , derives from the checkered pattern of the board on which it is played, while the term "draughts" refers to the dragging of pieces across the board. , also known as draughts, is a two-player board game played on a checkered board where players aim to capture all of an opponent's pieces or block their movement to prevent further play. The game is typically played on an board for , with each player starting with 12 pieces placed on the dark squares of the three rows closest to them; pieces move diagonally forward one square at a time unless capturing, in which case they jump over an adjacent opponent's piece to an empty square beyond, with multiple jumps mandatory if possible. The objective is achieved by capturing all opponent pieces or leaving them without legal moves, and a piece reaching the opponent's back row becomes a , gaining the ability to move and capture diagonally in any direction. Variations of checkers exist worldwide, with American checkers using the 8x8 board and rules prohibiting backward captures for non-kings, while employs a larger 10x10 board with 20 pieces per player and allows kings to move any number of unoccupied squares diagonally, similar to queens in chess but with distinct capture mechanics. In both variants, the player with the dark pieces (often black) moves first, and the board is oriented so that each player's nearest right-hand corner square is light. These differences affect strategy, with offering greater mobility for kings and more complex endgames. The origins of trace back to the ancient game of , evidenced by carvings from 1400 BCE in and archaeological finds from 600 BCE in the , which featured jumping captures on a grid board; modern evolved in the in by adapting to an 8x8 chessboard, initially called "Fierges," and gained popularity across by the 16th century through printed rulebooks. Earlier theories linking it directly to games in or , such as around 3000 BCE, suggest precursor influences but lack direct evidence for the jumping mechanics central to . Organized tournament play for began with the first recognized in 1847, when Anderson defeated James Wyllie in a match establishing the title for ; international competitions have continued under federations like the FMJD since 1885, with recent winners including J. Groenendijk of the in 2024 and 2025. Advancements in culminated in 2007 when the program, developed at the , solved by proving perfect play leads to a draw after analyzing over 500 billion billion positions, marking it as the largest game solved to date. As of 2025, digital versions of are widely available through mobile apps supporting multiplayer features, allowing real-time matches and opponents across variants like American checkers and . Popular apps such as enable global matchmaking and local play, enhancing accessibility for casual and competitive players alike.

Arts and media

Music works

Musical works titled "Check" or featuring the term prominently span various genres, often evoking themes of , , or confident assertion, with some incorporating lyrical nods to strategy or games. These pieces range from seminal tracks to ballads and contemporary pop-rap singles, demonstrating the word's versatility in songwriting. A notable example in hip-hop is "Check the Rhime" by , released in 1991 as the from their The Low End Theory. The track features Q-Tip and in a playful call-and-response format, celebrating their middle-class roots and rhyming prowess, and it helped define 's jazz-infused sound. It peaked at number 88 on the chart. In , the ' "," from their 2004 To the 5 Boroughs, serves as an energetic opener and , blending punk-rock energy with rap verses that urge listeners to "." Produced by the group themselves, it reached number one on the Alternative Songs chart and number 20 on the Hot 100, marking their comeback after a six-year . Beyoncé's "Check On It," featuring and released in 2005, is a crunk-inspired R&B track originally tied to the film but included on Destiny's Child's final album . Co-written and produced by , it topped the for five weeks and earned a Grammy nomination for Best Rap/Sung Collaboration. On the country side, George Strait's "," from his 1995 box set Strait Out of the Box, is a nostalgic love song written by Dana Hunt Oglesby and , recounting a childhood romance note. It became Strait's 30th number-one single on the chart and exemplifies his traditional style. More recently, Young Thug's "Check" (2015), the lead single from his mixtape , showcases influences with boastful lyrics about wealth and success, produced by . It debuted at number 100 on the , signaling Thug's rising prominence in . In 2025, Canadian rapper bbno released "check" on February 10, a bouncy [hip-hop](/page/Hip_hop_music)/pop track with humorous, self-assured bars about money and lifestyle, produced by [Y2K](/page/Y2K). It debuted at number 75 on the [Billboard Canadian Hot 100](/page/Canadian_Hot_100), reflecting bbno's signature quirky viral appeal.

Film and literature

In film, "Check" (2021) is an Indian Telugu-language prison drama directed by , starring as Aditya, a man wrongfully framed for and sentenced to death, who becomes a chess champion in prison while navigating politics and plotting his innocence through strategic alliances and legal battles. The narrative draws on chess motifs—such as checks and mates—to symbolize tactical deception and verification of truth amid institutional corruption, earning praise for its tense pacing despite plot conveniences. Earlier cinematic works titled around "check" often revolve around financial intrigue or . The "The Check Is in the Mail..." (1986), co-directed by and , follows salesman Richard Jackson () whose checks begin bouncing due to a computer , spiraling his family into absurd debts, cons, and a cross-country chase to clear his name, satirizing bureaucratic and the fragility of fiscal . Similarly, the "The Check" (2009), directed by Leif Gantvoort, Richard Keith, and Chris MacKenzie, depicts two estranged couples reuniting for lunch, where the arrival of the restaurant bill exposes underlying tensions about responsibility and past betrayals, culminating in a humorous standoff over . In literature, the graphic novel series "Check, Please!" by Ngozi Ukazu chronicles the life of Eric "Bitty" Bittle, a Southern gay vlogger and figure skater who joins a college team at fictional Samwell University, grappling with homophobia, first love, and team dynamics through vlog-style entries and illustrations. The title cleverly puns on the restaurant check (reflecting Bitty's aversion to conflict, like asking for the bill) and body-checking in , weaving themes of personal verification and emotional risk; the first volume appeared in 2013 as a before print editions in 2018, with the sequel "Sticks & Scones" released in 2022, concluding the duology with Bitty's post-graduation challenges. Television adaptations and episodes titled "Check" frequently explore procedural investigation or casual verification. The German comedy-drama series "Check. Check" (2019–2021), created by and starring as Jan, a naive young man who turns to illegal to fund his father's treatment, blending humor with themes of moral deception and familial loyalty across three seasons. In lighter fare, the Canadian "Check It Out!" (1985–1988), starring as supermarket manager Howard Bannister, dealing with eccentric staff and customer absurdities, where "check" nods to checkout lines and routine validations, running for three seasons on CTV. Across these works, "check" serves as a narrative device for probing , financial or strategic , and the quest for , often mirroring broader cultural anxieties about trust in systems—be it prisons, banks, , or .

Computing and technology

Data validation

In , refers to mechanisms that verify the and correctness of input or before further , ensuring errors such as transcription mistakes or syntactic violations are detected early. One key technique is the use of check digits, which are appended to numerical identifiers to detect common errors like single-digit substitutions or transpositions. These algorithms compute a supplementary digit based on a mathematical of the original , allowing validation by recalculating and comparing the result. A prominent example is the in ISBN-10 identifiers, where the final digit is calculated as the value that makes the weighted sum of the first nine digits congruent to 0 11. Specifically, the formula involves multiplying the digits from left to right by weights of 10 down to 2, summing the products, and setting the check digit d such that (sum + d) \mod 11 = 0, with d = 10 represented as 'X'. This method, standardized for book identification, detects nearly all single errors and adjacent transpositions. Similarly, the , patented by researcher in 1960, is widely used for numbers and other identifiers. In the Luhn method, starting from the rightmost digit (excluding the check digit), every second digit is doubled and, if the result exceeds 9, the digits are summed; the total sum including undoubled digits must then be divisible by 10 for validity. Beyond numerical data, syntax checking validates the grammatical structure of source code in compilers and integrated development environments (). This phase, known as or syntax analysis, employs context-free grammars to analyze tokens produced by , constructing a or while flagging deviations from the language's rules before execution. Tools like or modern parser generators automate this process, enabling early error detection in programming languages. The importance of these check functions lies in their ability to prevent propagation of errors, such as those from manual , thereby enhancing reliability in systems like financial transactions and . International standards like ISO/IEC 7064 define families of such algorithms, including modulo-11 and modulo-37 variants, to ensure and robust error detection across alphanumeric strings. As of 2025, advancements include the integration of and for and predictive validation in real-time , such as in platforms, where models flag potential input anomalies to improve accuracy. This establishes baseline data trustworthiness preceding more advanced security mechanisms.

Security mechanisms

In , security mechanisms referred to as "" primarily involve techniques to verify the of during or , ensuring that errors introduced by , hardware faults, or other unintentional alterations are detected. These methods generate a fixed-size value or bit pattern from the original , which is then recomputed at the receiving end and compared for . Unlike initial input validation processes that focus on syntactic correctness at entry points, these emphasize post-processing to safeguard against in transit or at . A checksum is a small, fixed-size value derived from a larger block of data through a hashing-like process, designed to detect accidental errors by representing the data's content compactly. For instance, the Cyclic Redundancy Check (CRC-32) employs polynomial division over binary data using a predefined generator polynomial, such as x^{32} + x^{26} + x^{23} + x^{22} + x^{16} + x^{12} + x^{11} + x^{10} + x^{8} + x^{7} + x^{5} + x^{4} + x^{2} + x + 1, to produce a 32-bit remainder that serves as the checksum; any discrepancy in this value upon recomputation indicates potential data alteration. This approach is particularly effective for detecting burst errors in digital communications, with CRC-32 offering a low probability of undetected errors, approximately $1/2^{32} for random bit flips. Parity checks provide a simpler for basic detection, particularly in systems, by adding a single to ensure the total number of 1s in a word is either even or odd. In even , the bit is set to make the count even; if a single bit flips during or , the recomputed parity will mismatch, flagging the . This method is commonly implemented in modules to spot single-bit faults but is limited to detecting an odd number of errors, failing silently on even counts. These checks find widespread application in network protocols and file systems. In the Transmission Control Protocol (), a 16-bit is calculated over the header, payload, and a pseudo-header including source and destination addresses, using one's complement summation to verify packet integrity during transmission; mismatched checksums trigger retransmission. For file verification, was historically used to generate 128-bit digests for comparing downloaded files against expected values, but by 2025, it has been deprecated due to vulnerability to collisions, with SHA-256—producing 256-bit outputs via the Secure Hash Algorithm family—adopted as the standard for robust integrity checks in and backups. Despite their utility, checksums and parity checks are limited to error detection without correction capabilities, as they cannot identify or repair the specific altered bits. Simple checksums may miss certain error patterns, such as those where bit flips cancel out in , and checks overlook even-numbered errors entirely. Over time, these have evolved into cryptographic hashes like SHA-256, which not only detect accidental changes but also resist intentional tampering through properties like preimage resistance and , addressing the shortcomings of non-cryptographic methods in security-sensitive contexts. By 2025, the relevance of these mechanisms has extended to quantum-resistant applications in blockchain systems, where traditional hashes face threats from quantum algorithms like Grover's that could undermine integrity checks. Blockchains such as Algorand (using FALCON) and the Quantum Resistant Ledger (QRL, using XMSS) integrate post-quantum cryptography with NIST-standardized signatures to ensure secure transaction verification against quantum attacks, maintaining data integrity in decentralized ledgers.

Patterns and designs

Textile motif

The check pattern is a classic textile motif characterized by a repeating grid of alternating squares formed by the intersection of warp and weft stripes of equal width, typically using two or three colors to create a balanced, symmetrical design. This even weave results in small, uniform blocks that evoke simplicity and order, distinguishing it from more irregular patterns like plaids. A prominent example is gingham, where equal-sized squares in contrasting colors, such as white and blue, produce a crisp, lightweight fabric ideal for everyday use. Evidence of check patterns dates back to ancient civilizations, with archaeological finds of checkered garments appearing in Egyptian textiles as early as the CE, often woven from using simple dyed threads. The gained widespread popularity in during the , particularly in , where district checks—such as shepherd's in black and white—were adapted for shirting fabrics, reflecting rural practicality and emerging techniques. These early Scottish variants laid the foundation for the pattern's integration into Western wardrobes, evolving from functional to versatile decorative elements. Common types include the bold buffalo check, featuring large-scale squares (often 6 to 12 inches) in two stark colors like red and black, originally derived from Scottish tartans but popularized in lumberjack attire for its durability. In contrast, the graph check employs finer lines to mimic , creating subtle, small-scale squares (typically under 1 inch) in a single accent color against a neutral ground, suited for refined applications. The pattern appears across diverse uses, from casual like shirts and dresses to , curtains, and tablecloths, where its geometric repetition adds visual structure without overwhelming other elements. Culturally, the check motif symbolizes informality and approachability, frequently linked to leisure activities such as picnics through red-and-white blankets that evoke nostalgic, outdoor Americana since the . In , trends emphasize in checked fabrics, with innovations like microbial-based dyes from biotech firms enabling vibrant, non-toxic colors on cottons and linens, significantly reducing water usage compared to traditional methods and aligning with eco-conscious consumer demands.

Woven variants

, a distinctive Scottish pattern, features multicolored stripes woven in the directions that intersect to form repeating , with each unique design traditionally associated with specific clans or regions to signify and . This complex checked builds upon simpler grids by incorporating multiple hues and precise sequencing for cultural depth. The weaving technique for employs a 2/2 structure, where the weft alternates over two threads and under two, creating a diagonal that enhances the of stripes into balanced checks. Standards for authentic tartans are maintained by the , which defines a as a twill-woven fabric with a repeating of threads in both directions, ensuring consistency in design and production. Tartan's history traces to the in the , where it emerged as a practical cloth for , with the oldest surviving example—a multi-colored featuring interlocking stripes in green, brown, red, and yellow—discovered in a bog dating to between 1500 and 1600. Following the Jacobite Rebellion of 1745 and defeat at Culloden in 1746, the British government enacted the Dress Act, banning and other attire to suppress identity, a that lasted until 1782. The revived in the amid interest in Scottish culture, spurred by events like IV's 1822 visit to in full , which popularized clan-specific tartans as symbols of national pride. In modern contexts, remains integral to traditional kilts and , while influencing global fashion, as seen in Burberry's iconic check—a -inspired pattern introduced in 1920 as a lining and now a hallmark of luxury apparel. By 2025, adaptations have proliferated worldwide, including hybrid kilts blending with contemporary materials like or neon accents for , and utility kilts in regions like , reflecting tartan's evolution into versatile, cross-cultural attire. Tartans distinguish between symmetrical and asymmetrical checks: symmetrical designs mirror around central pivot points for balanced repetition, while asymmetrical ones repeat sequentially without reflection, allowing for more fluid, non-mirrored patterns. New designs undergo a formal registration process via the Scottish Register of Tartans, where applicants worldwide submit a thread count specification detailing yarn colors and widths; upon verification against standards, the tartan receives an official reference number and entry date, preserving its authenticity without granting exclusive rights.

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