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CX

CX is an initialism with multiple meanings. In business, it most commonly refers to customer experience, the overall perception a customer has of a based on all interactions. For other uses, see the subsections below.

Organizations

Airlines

Airways is a based in , founded on 24 September 1946 by American pilot Roy C. Farrell and Australian businessman Sydney H. de Kantzow as a regional cargo service operating between Hong Kong, , and . The has since expanded into a major carrier, with its headquarters at adjacent to , serving as its primary hub. As of 2025, operates a fleet of approximately 180 passenger and cargo aircraft, including , A350, and models, supporting its network of over 100 destinations worldwide. It primarily focuses on long-haul flights from Hong Kong to key regions in , , and , with notable routes including daily services to major cities like , , and . In 2020, underwent a significant restructuring amid the , merging its wholly owned subsidiary —a regional carrier focused on intra-Asia routes—into the mainline operation, which led to the discontinuation of the brand and a reduction in overall capacity. This integration streamlined operations and allowed to consolidate its regional and long-haul fleets under a unified structure, enhancing efficiency while maintaining its position as a founding member of the alliance. The two-letter IATA airline designator "CX" was assigned to by the (IATA) to uniquely identify the carrier in global aviation systems, including flight numbering, ticketing, and baggage handling. This code is used on all flights, such as CX880, a daily non-stop service from (HKG) to (LAX), which typically operates using a 777-300ER and covers approximately 11,580 kilometers in about 12 hours. The assignment of "CX" reflects IATA's standardized for allocating designators based on airline names and operational needs, ensuring interoperability across international air travel networks.

Companies

CEMEX, S.A.B. de C.V. is a Mexican multinational building materials company founded in 1906 and headquartered in , . The company specializes in the production and distribution of , , aggregates, and related construction materials, serving infrastructure and building projects worldwide. Its American Depositary Receipts (ADRs) have been listed on the under the ticker symbol CX since September 15, 1999, facilitating access for international investors. CEMEX expanded globally through strategic acquisitions, notably purchasing the UK-based RMC Group in March 2005 for $4.1 billion in cash, which positioned it as the world's largest producer and third-largest manufacturer at the time, while extending operations to over 50 countries across , , and the . This deal enhanced its integration and market diversification, contributing to sustained growth in emerging and developed markets. As of November 2025, the company's trailing twelve-month stood at approximately $15.67 billion, reflecting its scale in the global sector despite economic fluctuations. The Connex Group Australia operated as a key player in 's privatized passenger rail sector, particularly managing urban train services in under the Connex brand from 1999 to 2009. Formed through the Victorian government's of the state's system in 1999, Connex secured franchises for the Hillside (northern and western suburbs) and Bayside (southern suburbs) rail networks, previously part of the Public Transport Corporation, marking one of the first full-scale urban rail privatizations globally. These operations focused on commuter services, handling millions of passengers annually across Melbourne's metropolitan lines with an emphasis on reliability and capacity expansion amid growing urban demand. As a of the UK-based Express Group, Connex integrated Australian services into its broader portfolio, but faced challenges including underinvestment and performance issues, leading to government intervention. The franchises were not renewed at the end of the 2004–2009 agreement due to operational shortcomings, resulting in the repossessing the networks and awarding them to a new , Metro Trains Melbourne, effective November 30, 2009; during this period, Connex received over $2 billion in subsidies from the Victorian government to maintain services. This de-privatization highlighted risks in long-term rail franchising models. Connex's Australian activities overlapped with broader transportation reforms, particularly in contexts, before the company's exit from the market.

Media Outlets

The , commonly abbreviated as CX, is a major Japanese terrestrial broadcaster serving the from its headquarters in , . Established in November 1957 and commencing broadcasting on March 1, 1959, it operates under the call sign JOCX-DTV on virtual channel 8 (UHF digital channel 21). As the flagship station of the (FNN) and (FNS), CX has played a pivotal role in Japan's television landscape since its inception. Owned by Fuji Media Holdings, Inc., a certified broadcast , CX focuses on delivering a diverse array of programming tailored to broad audiences, including high-profile dramas, series, and variety shows. Its drama slate features influential series such as "The Confidence Man JP," which has spawned sequels, films, spin-offs, and international remakes distributed in over 240 countries. programming, often broadcast in dedicated blocks like +, includes popular titles that contribute to CX's strong appeal among younger viewers. Variety shows, such as "VS School The Ultimate ," emphasize entertainment formats that have been licensed internationally, underscoring CX's global content strategy. CX is closely associated with major cultural events, notably broadcasting the , Japan's largest outdoor music event, through its Fuji TV NEXT channel. This partnership highlights the network's commitment to live event coverage and music programming, enhancing its role in promoting contemporary Japanese culture.

Science and Technology

Biology and Medicine

In biology and medicine, "CX" commonly abbreviates "connexin," referring to a family of transmembrane proteins that form , which are specialized intercellular channels facilitating direct communication between adjacent cells. These proteins enable the passage of ions, small metabolites, and signaling molecules, playing crucial roles in tissue homeostasis, development, and coordinated cellular activities such as electrical coupling in excitable tissues. Connexins typically consist of four transmembrane domains, two extracellular loops, one intracellular loop, and cytoplasmic N- and C-termini, with the extracellular loops mediating docking between hemichannels (connexons) from neighboring cells to form complete . Among the over 20 human connexin isoforms, connexin 43 (Cx43), encoded by the GJA1 gene, is the most abundant and widely expressed, particularly in the heart where it supports synchronized contraction and in the where it aids neuronal signaling. 26 (Cx26), encoded by GJB2, is prominent in the and , essential for sensory and barrier functions. in connexins are linked to numerous diseases; for instance, Cx26 mutations account for up to 50% of congenital nonsyndromic by disrupting junction-mediated potassium recycling in the . Other pathologies include oculodentodigital dysplasia from Cx43 variants and skin disorders like erythrokeratodermia variabilis from Cx31 defects, highlighting connexins' role in inherited channelopathies. Recent advances as of 2025 have focused on for connexin-related disorders, particularly . (AAV)-mediated delivery of corrected GJB2 genes has restored auditory function in preclinical models of Cx26 deficiency, with base-editing techniques repairing dominant-negative like R75W to normalize plaques. Preclinical studies, including AAV-mediated delivery and base-editing techniques repairing like R75W, have shown promise in restoring auditory function in models of Cx26 deficiency. As of 2025, preparations for clinical trials are underway, with companies advancing toward IND-enabling studies. In gynecology, "Cx" abbreviates "," denoting the lower, cylindrical portion of the that connects the endometrial cavity to the , measuring approximately 3-4 cm in length and 2-3 cm in diameter in non-pregnant adults. Composed of fibromuscular with an outer squamous and inner columnar meeting at the transformation zone, the secretes that facilitates transport during while acting as a barrier against pathogens during other phases. Its primary reproductive roles include dilating up to 10 cm during labor to permit fetal passage and maintaining closure via a mucus plug in to prevent ascending infections. Common procedures involving the cervix include the Pap smear (cervical cytology), a screening test where cells are collected from the ectocervix and endocervix using a and to detect precancerous changes, often combined with HPV testing for enhanced sensitivity. This outpatient procedure, recommended every 3-5 years for women aged 21-65, has significantly reduced mortality by identifying early. , primarily caused by persistent HPV infection, had an estimated global incidence of 662,301 new cases in 2022, with projections indicating sustained high burden in low-resource settings despite and screening efforts.

Computing

In x86 architecture, the CX register is a 16-bit general-purpose register introduced with the in 1978. It serves primarily as a counter for loop operations in programming, particularly in conjunction with the REP (repeat) instruction prefix, which automates repetitive string operations such as memory moves or comparisons until the CX value reaches zero. For example, the following assembly snippet uses CX to repeat a byte move operation from source to destination memory: 
mov cx, 10          ; Load loop count into CX
rep movsb           ; Repeat MOVSB CX times: move [SI] to [DI], decrement CX and SI/DI
This decrements CX after each iteration and halts when CX is zero, enabling efficient handling of variable-length data blocks without explicit branching. Over time, the register evolved to support wider architectures: the 32-bit extension ECX appeared in the 80386 processor in 1985 for enhanced addressing and operations, while the 64-bit RCX was added in the extension (initially by in 2003 and adopted by ), maintaining by allowing access to lower bits as ECX or CX. C++/CX is a language extension developed by for programming the Windows Runtime (WinRT), first introduced in 2012 as part of 2012 to enable C++ developers to create Metro-style applications for Windows 8. It introduces syntax for defining reference-counted classes, known as ref classes, using the to denote handles to WinRT objects, which automates through similar to COM interfaces. For instance, a basic ref class declaration might appear as: 
public ref class MyClass sealed {
public:
    void MyMethod();
};
Instances are created and referenced via handles like MyClass^ obj = ref new MyClass();, facilitating seamless integration with WinRT for tasks such as UI development in (UWP) apps. However, C++/CX was deprecated starting in 2019, with recommending migration to the standard C++/WinRT projection by 2022, as the former relies on non-standard extensions that limit portability. As of 2025, migration involves replacing ^ handles with std::unique_ptr or winrt::com_ptr, converting ref classes to sealed structs or classes with WinRT attributes, and updating property syntax to use the [[deprecated]] attribute for legacy compatibility where needed. In , particularly the (IMS), the Cx interface is a -based reference point that enables communication between the Home Subscriber Server (HSS) and serving Call Session Control Functions (CSCF), such as the Interrogating-CSCF (I-CSCF) or Serving-CSCF (S-CSCF), for user authentication and profile management. Defined in Technical Specification TS 29.228, it supports procedures like the Multimedia Authentication Request/Answer exchange, where the CSCF queries the HSS for authentication vectors and user data to authorize sessions. The protocol leverages the base specification ( 6733) with 3GPP-specific Attribute-Value Pairs (AVPs) outlined in TS 29.229, ensuring secure transfer of subscriber information without exposing sensitive keys. In networks, the Cx interface persists for IMS integration and interworking with the 5G core, particularly in non-standalone deployments where the HSS provides authentication data to the Unified Data Management (UDM) function via , supporting seamless voice and multimedia services over 5G New Radio.

Engineering and Physics

The CX noise reduction system, developed by CBS Laboratories in the late 1970s and publicly announced in 1981, is an analog audio companding technique designed to enhance dynamic range and reduce noise in recorded media. It employs a 2:1 compressor-expander mechanism that applies logarithmic compression to low-level signals below approximately -20 dB, boosting them by up to 20 dB during encoding to minimize surface noise and hiss, while the decoder reverses this process to restore the original signal without introducing artifacts. This system was initially targeted for vinyl LP records to extend dynamic range beyond the typical 50-60 dB limit, but it saw limited adoption there due to compatibility concerns with non-equipped turntables. In 1982, integrated CX into the analog audio tracks of players, such as the LD-600 and later models like the LD-1100, where it improved signal-to-noise ratios to around 72 dB and to 80 dB on compatible discs. The encoding process embeds a sub-audible pilot tone to synchronize and expansion, ensuring by allowing playback without decoding, albeit with reduced benefits. By the early 2000s, CX became obsolete as digital formats like DVD and supplanted analog optical media, eliminating the need for such . As of 2025, renewed interest in retro audio preservation has spurred archival efforts to digitize CX-encoded s, leveraging enthusiast communities and restored players to capture high-fidelity analog soundscapes. In , the , often denoted as C_x in certain contexts, is a dimensionless that quantifies an object's resistance to motion through a like air or . It is defined by the formula C_x = \frac{F_d}{\frac{1}{2} \rho v^2 A}, where F_d is the drag force, \rho is the fluid density, v is the , and A is the reference area (typically the frontal cross-section). This coefficient encapsulates shape, , and flow regime effects, with values ranging from near 0 for streamlined bodies to over 1 for bluff objects. The concept traces its origins to Newton's Philosophiæ Naturalis Principia Mathematica (1687), where he proposed drag proportional to velocity squared and the sine of the angle of incidence, laying foundational principles despite inaccuracies in his assumed resistance laws. In automotive and , C_x optimization reduces fuel consumption and improves efficiency; for example, modern passenger cars typically achieve values of 0.25 to 0.35 through aerodynamic shaping like sloped roofs and underbody panels. Lower C_x values, such as 0.20 for the , enable significant gains in high-speed applications. Building commissioning (Cx), as outlined in Standard 202-2013, is a systematic process in to verify that building systems—such as HVAC, electrical, and —perform according to intent and owner requirements. The process begins with pre-design planning to establish the owner's project requirements (OPR), followed by design-phase reviews to ensure systems align with OPR and applicable codes. During construction, submittal reviews and functional performance testing confirm quality, while integrated systems testing simulates real-world operations to identify deficiencies. The handover phase involves training operations staff, documenting as-built conditions, and developing maintenance plans, culminating in a final report certifying system readiness. In 2025, Cx has gained prominence in sustainable certifications like , where it is mandatory for envelope and core systems to support decarbonization goals, such as verification and post-occupancy monitoring for ongoing performance. This emphasis ensures buildings achieve net-zero readiness while minimizing operational inefficiencies.

Places

Geographical Locations

Christmas Island, an external territory of located in the approximately 360 kilometers south of Java Head, , is designated with the ISO 3166-1 alpha-2 CX. This remote coral , formed atop a submerged , spans 135 square kilometers and features dramatic limestone cliffs, rainforests, and endemic . Phosphate mining, which began in the late 1890s under British administration and drove much of the island's early , shaped its landscape until operations ceased in 1987 due to environmental concerns. The island's population is 1,692 as of the 2021 census, with little change estimated as of 2025, and the majority residing in coastal settlements like . Demographically, per the 2021 census, top ancestries include (22.2%), (17.0%), and (16.1%), reflecting historical labor migrations for and a multicultural society with influences from . Politically, Christmas Island was annexed by the United Kingdom in 1888 as part of the Straits Settlements and transferred to Australian sovereignty on 1 October 1958 via the Christmas Island Act 1958, marking its integration as an Australian external territory administered by the Department of Infrastructure, Transport, Regional Development, Communications and the Arts. Full administrative and citizenship integration for residents followed in the early 1980s, solidifying its status under Australian governance. In international contexts, the CX code is recognized by the and ISO standards for official representations of the territory, facilitating diplomatic, trade, and statistical uses. Environmentally, about 63% of the island is protected within , established to conserve unique ecosystems, including the annual migration of tens of millions of red crabs (Gecarcoidea natalis) that play a key role in forest regeneration. This designation adjoins the Christmas Island Marine Park, enhancing protections for surrounding coral reefs and migratory species. The code also serves as the for internet registrations associated with the territory.

Postal and Domain Codes

The (ccTLD) is assigned to , an external territory of located in the . It was delegated by the (IANA) and has been operational since 1997. The domain is managed by the Christmas Island Domain Administration Limited (cxDA), a not-for-profit entity responsible for its stability and administration, with technical operations handled by CoCCA Registry Services. Registration of .cx domains is open to global registrants through accredited registrars, provided they comply with law, public policy, and aspects of culture; there are no residency requirements. As of mid-2025, approximately 2,500 .cx domains are registered, reflecting modest growth and popularity for niche applications such as local businesses, sites, and creative uses like "" branding. Notable examples include portals, such as the official of website at shire.gov.cx, which provides local information and services.

Transportation

Automotive Models

The Mazda CX series represents a lineup of crossover SUVs produced by Mazda Motor Corporation, emphasizing versatile, stylish vehicles that blend sporty handling with practical utility. Introduced as part of Mazda's shift toward expanding its SUV offerings, the series draws on the company's Kodo: Soul of Motion design philosophy, which seeks to evoke a sense of fluid, organic movement through sleek lines and balanced proportions, first unveiled in 2010. This aesthetic has become a hallmark of the CX models, contributing to their appeal in competitive markets. The series evolved from earlier efforts like the CX-7, marking Mazda's early foray into crossovers with a focus on all-wheel-drive (AWD) systems for enhanced traction and stability. The CX-7, produced from 2007 to 2012, served as the precursor to the modern CX lineup, introducing Mazda's Active Torque-Split AWD system that dynamically distributes up to 50% of power to the rear wheels for improved handling on varied surfaces. This midsize crossover featured a 2.3-liter turbocharged inline-four engine and was discontinued to make way for more efficient models, but it laid the groundwork for the series' emphasis on driver engagement and AWD integration across subsequent vehicles. The CX-3, a subcompact crossover available from to 2021, utilized a 2.0-liter Skyactiv-G four-cylinder producing 146 horsepower in North American markets, paired with a six-speed and optional i-Activ AWD. Global sales exceeded 1 million units during its run, underscoring its popularity as an entry-level urban with agile dimensions and fuel efficiency around 29 mpg combined. Succeeding the CX-3, the CX-30 has been offered since 2019 as a subcompact crossover incorporating technology, including a standard 2.5-liter engine delivering 191 horsepower and up to 250 horsepower in turbo variants, with i-Activ AWD standard on higher trims. The 2025 model features refined tuning for smoother performance and updated infotainment, maintaining its position as a nimble daily driver with 29 mpg combined efficiency. The CX-5, launched in 2012 as a compact crossover, remains Mazda's top-selling model globally, with cumulative sales surpassing 4.5 million units as of July 2025 and continuing strong performance into 2025. A second-generation CX-5 was revealed in July 2025 for the 2026 model year, featuring refined styling and options. Powered by Skyactiv-G 2.5-liter engines (187 or 256 horsepower in turbo form) and available with i-Activ AWD, it received a mid-cycle refresh for 2025, including enhanced interior materials and advanced driver aids, while achieving up to 30 mpg highway. In May 2025 alone, CX-5 sales reached 23,855 units worldwide. Introduced for the 2023 model year and targeted primarily at , the CX-50 is a midsize crossover built on a rear-wheel-drive-biased platform, offering a 2.5-liter turbo engine with 256 horsepower and standard i-Activ AWD for off-road capability. It features rugged styling aligned with Kodo principles and sold 8,876 units in September 2025, reflecting growing demand in the adventure-oriented segment. Mazda's premium CX models, including the CX-60 (introduced in 2022 for markets outside ), CX-70 (2025 North American two-row variant), CX-80 (three-row for and ), and CX-90 (2024 North American three-row flagship), utilize the company's new rear-wheel-drive architecture with a 3.3-liter inline-six turbocharged producing up to 340 horsepower, alongside plug-in hybrid (PHEV) options combining a 2.5-liter four-cylinder with electric motors for 323 horsepower and up to 26 miles of electric range. These models incorporate advanced Kodo with longer wheelbases for spacious interiors and i-Activ AWD, positioning Mazda in the luxury space; for instance, the CX-90 PHEV earned the 2025 Best SUV award from . Overall, the CX series accounts for a substantial portion of Mazda's sales, with SUVs comprising around 70% of U.S. volume in early 2025 and contributing to global figures of approximately 1.3 million vehicles for the ending March 2025. This impact highlights the lineup's role in Mazda's strategy to prioritize crossovers, driven by their blend of Kodo design, efficiency, and AWD prowess. The series' low drag coefficients, often below 0.33, further enhance fuel economy and performance in line with principles.

Rail and Public Transit

Connex Melbourne was an Australian metropolitan rail franchise operator that provided passenger services in from 1999 to 2009, branded under the Connex name and abbreviated as CX in various operational contexts. Initially awarded a 15-year concession in 1999 as part of 's , it operated the Hillside and lines before expanding to the entire metropolitan network in April 2004 following the withdrawal of rival operator National Express. The network encompassed 15 lines and over 200 stations across 371 kilometers of track, serving approximately 135 million passenger boardings annually by 2004. However, the operator faced significant performance challenges, including declining punctuality (with on-time performance hovering around 94% but marred by frequent cancellations), overcrowding during peak hours due to insufficient rolling stock after scrapping older trains, and failure to meet patronage growth targets, achieving only 7% increase from 2000 to 2004 against expectations of 40-80%. These issues prompted government intervention in 2004, renegotiating Connex's contract to a shorter 4.5-year term with enhanced subsidies totaling $2.3 billion and a revised revenue-sharing model to stabilize operations. The franchise ended in November 2009, with operations transitioning to , a that inherited Connex's and continues to manage the expanded network today, incorporating improvements in fleet modernization and service reliability. In the United Kingdom, Connex South Eastern operated the South Eastern rail franchise from October 1996 to November 2003, utilizing CX branding in ticketing systems as part of its Connex Group affiliation. Established under the broader privatization of British Rail initiated in 1996, which divided the network into 25 franchises to introduce competition, Connex South Eastern managed commuter and regional services from London to Kent and Sussex, including key routes to destinations like Dover, Hastings, and Sevenoaks, with approximately 1,800 daily services carrying 132 million passengers per year. The operator encountered persistent service disruptions, such as 20% of trains running late and peak-hour overcrowding exceeding 103% capacity, leading to regulatory scrutiny and financial penalties from the Strategic Rail Authority (SRA). A 2002 audit by PricewaterhouseCoopers revealed severe deficiencies in financial management and budgeting, resulting in a £58 million emergency subsidy that ultimately eroded confidence in the operator. Consequently, the SRA terminated the franchise mid-term in June 2003—the first such action since privatization—forcing Connex to hand over operations to the publicly owned South Eastern Trains by November 2003, after which the franchise was re-awarded to private operators with stricter performance clauses.

Other Uses

Business and Management

In business management, CX also serves as an abbreviation for commissioning (Cx), a process ensuring projects, particularly in and facilities, meet operational requirements and deliver intended performance. Cx in involves systematic verification of systems from design through handover, focusing on aligning deliverables with objectives to maximize (ROI). Studies show that effective Cx yields a 16% savings in buildings and a of 1.1 years, reducing long-term operational costs and enhancing asset value. This practice links to oversight but emphasizes financial outcomes, such as fewer change orders and optimized , to support sustainable profitability.

Mathematics and Notation

In Roman numerals, CX denotes the number 110, formed additively from C representing 100 and X representing 10. This system originated in ancient Rome around the 8th century BCE, where numerals like CX were employed for practical counting, record-keeping, and inscriptions on public monuments, coins, and legal documents to denote quantities such as years, distances, or tallies. For instance, combinations of C and X appeared in architectural labels and military notations to mark capacities or positions. The formation of follows specific rules, including to express values more efficiently without excessive repetition. In subtractive cases, a smaller precedes a larger one to indicate , but only certain pairs are permitted: I (1) before V (5) or X (10) for 4 or 9; X before L (50) or C (100) for 40 or 90; and C (100) before D (500) or M (1000) for 400 or 900. Thus, is written as XCIX (100 - 10 + 10 - 1), not IC, because I cannot subtract from C under standard rules, which limit subtractions to one-tenth or half the larger value to maintain consistency and avoid ambiguity in ancient scripts. These conventions evolved during the and Empire to streamline writing on stone and . In modern contexts, Roman numerals including CX persist in formal listings, clock faces (extended beyond 12 for specialized dials), numbering in books, and event sequencing, such as the hypothetical 110th Super Bowl denoted as CX if using full Roman notation, though events like (40) demonstrate the system's ongoing additive and subtractive application.

Historical and Symbolic

Beyond numerical representation, CX functioned as an abbreviation in institutional contexts, notably as a for the Consilium X (), the powerful governing body of the during the . Established in 1310, the Council wielded significant executive and judicial authority, and its emblem—interlocked letters forming CX—was inscribed or painted on official artifacts, including armory, swords, and architectural elements in the . These 15th-century examples, such as engraved halberds and horse armor, symbolized the Council's oversight of state security and its role in maintaining Venetian oligarchic stability, appearing prominently in armories to denote state property and authority. Symbolically, the CX monogram extended into heraldic and emblematic traditions, representing institutional power rather than familial lineage. In contexts, it evoked themes of vigilance and collective , often integrated into decorative motifs on public buildings and to reinforce the Republic's dominance. This usage parallels broader European practices of abbreviated symbols in , distinct from personal crests, and underscores CX's role in visual for authority during the 14th to 16th centuries. While connected to Roman numeral systems in , its symbolic weight lay in political . In modern niche contexts, CX has appeared symbolically in entertainment, particularly gaming, as part of the title , a long-running retro gaming television series produced by since 2003. The "CX" derives from the broadcaster's callsign (JOCX-TV), symbolizing its affiliation and evoking a nostalgic, archival approach to history through challenges and retrospectives. This branding has become iconic within global gaming culture, representing endurance and cultural preservation in the medium.