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DX

DX is an abbreviation with multiple meanings.

In arts and entertainment

Music

In music, "DX" most prominently refers to the Yamaha DX series of digital synthesizers, particularly the flagship DX7 model introduced in 1983, which revolutionized sound synthesis through frequency modulation (FM) technology. Developed by Yamaha in collaboration with Stanford University professor John Chowning, who patented FM synthesis in the 1970s, the DX7 was the first commercially successful digital synthesizer, selling more than 150,000 units in its first year and becoming a staple in studios worldwide. Its bright, metallic timbres defined the sound of 1980s pop, rock, and electronic music, appearing on seminal tracks such as George Michael's "Faith," Stevie Wonder's "Skeletons," and Kraftwerk's later works, while its preset voices like "St. Elmo's Fire" and "DX Bass" influenced genres from synth-pop to hip-hop production. The instrument's 6-operator FM engine allowed for complex, evolving sounds that analog synthesizers struggled to replicate, marking a shift from subtractive to digital synthesis and enabling more precise, programmable tones that shaped MIDI-era music production. DX also denotes the sole studio album by hip-hop production duo Friendzone (James and Reznick), self-released on , , as a name-your-price download. Spanning 94 minutes across 12 main tracks and 9 bonus cuts, the instrumental project blends aesthetics with lo-fi and chopped-and-screwed techniques, drawing from 1990s PC and hip-hop influences. Notable tracks include "Poly," for which a was produced, and "Taswell," showcasing the duo's experimental beats; the album received acclaim for rethinking digital music paradigms, ranking #47 on Fact magazine's "50 Best Albums of " and #3 on Cokemachineglow's year-end list. Several artists perform under the moniker DX, including a Canadian-Ethiopian rapper known for blending English and lyrics in tracks like "Hustla Baby" (2025), emphasizing cultural fusion and wordplay. Additionally, DX-DIGITAL is an Austrian synthwave producer based in , active since 2018, who releases retro-futuristic and on , such as singles featuring collaborations with vocalists like Lucie. The term DX briefly influenced music in wrestling-themed media through The DX Band, led by vocalist Chris Warren, whose rock anthems provided entrance themes for entertainment personas in the late .

Professional wrestling

Degeneration X (DX), an iconic stable in (formerly the World Wrestling Federation or ), was formed in the summer of 1997 by and , initially including Chyna as a key enforcer and as their "insurance policy." The group officially adopted the name on the October 13, 1997, episode of , where coined the term during a promo targeting and the following the at 1997. Known for their rebellious attitude that defied authority figures like , DX popularized edgy humor, crotch chops, and catchphrases such as "Suck It," which became synonymous with their provocative style and helped define the . The stable expanded to include X-Pac, , and , blending athletic prowess with comedic antics that mocked rivals and even drove a tank to WCW headquarters in a infamous 1998 invasion angle. As a tag team, DX had several notable iterations, particularly during their original run and reunions, where members like Triple H and Shawn Michaels, or later the New Age Outlaws (Road Dogg and Billy Gunn), competed in high-profile matches. At WrestleMania XIV in 1998, DX interfered in the main event to support Michaels in his WWF Championship loss to Stone Cold Steve Austin, while the New Age Outlaws defended the WWF Tag Team Championship in a Dumpster Match against Cactus Jack and Chainsaw Charlie. Their feud with The Nation of Domination escalated in 1998, featuring a chaotic street fight on the August 17 episode of Raw and culminating in a ladder match at SummerSlam where Triple H defeated The Rock for the Intercontinental Championship. At Survivor Series 1997, DX participated in an elimination match against the Hart Foundation, and during their 2006 reunion, Team DX (Triple H, Shawn Michaels, CM Punk, and The Hardy Boyz) defeated Team Rated-RKO in a traditional Survivor Series match. DX reunited multiple times, including a major reformation in June 2006 by and , who captured the World Tag Team Championship, and again in 2009 before Michaels' retirement in 2010. The group made a final significant appearance in 2018, reuniting on on for their 25th anniversary celebration, leading to a at Crown Jewel where and Michaels defeated The ( and ). Inducted into the in 2019 as both the original 1997-1998 incarnation and the 1999-2000 version, DX's legacy of anti-authority rebellion and faction dynamics has influenced modern groups like and . Their cultural impact briefly extended to music parodies, such as altered entrance themes mimicking pop songs to amplify their humorous entrances.

Businesses and organizations

Logistics and information technology companies

DX (trading as DX Delivery) is a British logistics and mail services company founded in 1975 as a Document Exchange network primarily serving the legal sector with secure document delivery. In January 2024, the company was acquired by H.I.G. Capital in a £315 million deal and taken private. It has evolved into a comprehensive provider of end-to-end mail, parcels, and logistics solutions across the UK and Ireland, emphasizing secure and tracked services for sensitive materials. Key offerings include DX Exchange, a private business-to-business network for overnight delivery of legal documents with pre-9am arrival guarantees, and DX Tracked Specimens, a specialized service for transporting medical samples and specimens under controlled conditions. The company operates a network of 110 depots throughout the UK and Ireland, enabling efficient collection and distribution for business-to-business and residential addresses. DXC Technology is an American multinational services and consulting corporation formed on , 2017, through the merger of and the Enterprise Services division of . Headquartered in , DXC specializes in helping enterprises modernize , with core expertise in cloud migration services that facilitate the transition of applications and workloads to and cloud environments using automated and optimization tools. It also provides cybersecurity solutions, including across and remote environments, controls, and strategies to protect expanding enterprise perimeters. In 2023 (ended March 31, 2023), DXC reported global revenues of $14.43 billion, reflecting its scale as a provider of services to and clients worldwide.

Other businesses and organizations

In the context of , DX refers to long-distance communications, and several organizations and informal groups are dedicated to promoting this activity. The DX Century Club (DXCC), administered by the (ARRL), is a prominent program recognizing operators who confirm contacts with at least 100 distinct countries or territories, fostering a global community of enthusiasts through verified QSL cards or electronic confirmations. This initiative, established in 1933, encourages participation in international radio exchanges and has awarded certificates to thousands of hams worldwide, emphasizing the technical and operational challenges of . Numerous DX associations operate as nonprofit entities to support DX pursuits, including information sharing, contests, and logistical aid. The International DX Association (INDEXA), founded in 1983, is an international focused on facilitating DX contacts by providing resources, newsletters, and advocacy for spectrum access, with membership open to radio s globally. Similarly, regional groups like the National Capitol DX Association (NCDXA), established in 1972, promote through monthly meetings, guest speakers, and support for award programs, while collaborating with other clubs to enhance amateur radio's international reach. These associations often maintain QSL bureaus for confirming contacts and organize events that build camaraderie among members. DXpeditions represent event-based organizational efforts within the DX community, where teams of operators travel to rare or geographically isolated locations to activate "new entities" for the DXCC list, enabling rare contacts for operators worldwide. Sponsored by clubs like the Northern California DX Foundation or coordinated through INDEXA, these expeditions require meticulous planning, including equipment transport, licensing, and fundraising, and have activated over 300 entities since the 1920s, significantly impacting DX award achievements. For instance, the February 2023 activation of (3Y0J) by an international team logged approximately 18,600 contacts, highlighting the collaborative nature of these temporary organizations. These DX-focused groups occasionally intersect with broader organizations, such as through shared frequency monitoring or international regulatory advocacy.

In science, technology, and mathematics

In , "DX" or "Dx" serves as an abbreviation in several distinct contexts, primarily related to diagnostics, pharmacology, and nanotechnology applications in . The abbreviation "Dx" is a standard medical shorthand for "," referring to the process of identifying a patient's condition through clinical assessment, symptoms, and tests. It has been used in clinical , patient records, and healthcare communication since the early to denote a confirmed or suspected diagnosis, such as "Dx: " in medical notes. This notation enhances efficiency in medical reporting while maintaining precision in patient care. In pharmacology, "DX" commonly abbreviates dexamethasone, a synthetic with potent and immunosuppressive properties, first synthesized in 1957 and approved for medical use in 1958. Dexamethasone binds to receptors to inhibit inflammatory mediators, making it effective for treating conditions like allergies, , autoimmune disorders, and . It gained renewed prominence during the as part of the trial protocol, where it reduced mortality in hospitalized patients requiring oxygen by approximately one-third. In , it is frequently denoted as "DX" for brevity in discussions of regimens. In —a field at the intersection of and —"DX" refers to the double crossover (DX) motif, a fundamental building block for assembling nanoscale structures using . Introduced in the early 1990s by Nadrian Seeman and colleagues, the DX molecule consists of two DNA double helices connected by two Holliday junction-like crossovers, providing rigidity and enabling into tiles, lattices, and other motifs for applications in molecular and . This design mimics recombination intermediates in genetic processes and has facilitated the creation of addressable DNA nanostructures with nanometer-scale precision. Seminal work on DX tiles demonstrated their utility in forming periodic two-dimensional arrays, advancing structural DNA nanotechnology for biomedical sensing and therapeutics.

Computing and telecommunications

In computing, DX commonly refers to several key elements in hardware and software architectures, particularly within the x86 ecosystem and programming. The DX register is a 16-bit general-purpose register in the x86 instruction set architecture, introduced with Intel's 8086 microprocessor in 1978. It serves primarily for data storage, arithmetic operations, and tasks in assembly language programming, often paired with the AX register for 32-bit operations or used independently for port addressing. This register's design contributed to the flexibility of early personal applications, enabling efficient handling of 16-bit without frequent access. Building on the x86 foundation, DX variants appear in Intel's microprocessor naming conventions to denote enhanced capabilities. The 80386DX, released in 1985, was the flagship model of Intel's 80386 family, featuring a full 32-bit external data bus for high-performance computing and multitasking support. In contrast, the 80386SX variant used a 16-bit external bus to reduce costs, limiting bandwidth but maintaining internal 32-bit processing. Similarly, the 80486DX, introduced in 1989, integrated a full 32-bit data bus with an on-chip floating-point unit (math coprocessor), boosting performance for scientific and graphical workloads over the 80486SX, which omitted the coprocessor to target budget systems. These DX designations highlighted Intel's strategy to differentiate premium models with complete bus and coprocessor support, influencing PC architecture through the 1990s. In software development, —often abbreviated as DX—represents Microsoft's suite of application programming interfaces () for multimedia-related tasks on Windows platforms, with a strong emphasis on game programming and graphics rendering. First released in September 1995 as part of the Windows Game SDK, it unified hardware acceleration for audio, video, and input devices, replacing fragmented earlier APIs. Subsequent versions evolved significantly; for instance, DirectX 12, launched in 2015, introduced advanced features like for realistic lighting simulations and Variable Rate Shading to optimize rendering performance by varying pixel detail levels. These enhancements enable developers to leverage modern GPUs more efficiently, supporting complex scenes in real-time applications without excessive computational overhead. Another prominent use of DX in software contexts is "developer experience," a term denoting the , efficiency, and overall satisfaction developers derive from tools, workflows, and environments in building applications. Popularized in the 2010s amid the rise of agile methodologies and cloud-based development, DX draws from principles to emphasize intuitive integrated development environments (), clear API documentation, and streamlined processes. By focusing on reducing friction in coding tasks—such as seamless or collaborative —strong DX correlates with faster project delivery and higher developer retention, as evidenced in studies of global software teams.

Mathematics

In mathematics, the notation dx primarily refers to the differential of the variable x, representing an infinitesimal change in x within the framework of calculus. This notation was introduced by Gottfried Wilhelm Leibniz in the late 17th century as part of his development of infinitesimal calculus, where it symbolizes an arbitrarily small increment used to approximate continuous change. The differential dx plays a central role in expressing derivatives and integrals. In derivatives, the ratio \frac{dy}{dx} denotes the limit of the ratio of infinitesimal changes \frac{\Delta y}{\Delta x} as \Delta x approaches zero, capturing the instantaneous rate of change of y with respect to x. In integrals, the symbol \int f(x) \, dx represents the limit of sums of products f(x_i) \Delta x as the partition of the interval becomes infinitely fine, accumulating area under the curve of f(x). Beyond pure , uppercase DX appears in geometric and vector contexts to denote directed , which accounts for both and , potentially positive or negative depending on . This usage is particularly noted in , where DX can represent the vector component along the x-, facilitating calculations of paths and forces in multivariable settings. Such notations briefly extend to simulations for modeling continuous processes like particle motion.

Photography and imaging

In photography, DX coding refers to an optical encoding system developed by Eastman Kodak for 35mm film cassettes. Introduced in March 1983, it consists of a standardized pattern of two rows of reflective and non-reflective bars printed on the cassette's exterior, which compatible cameras can optically scan using light-emitting diodes and photodetectors to automatically detect and set the film's ISO speed as well as the number of exposures. This innovation, first implemented on Kodak's Kodacolor VR film, addressed common exposure errors by enabling point-and-shoot cameras to adjust settings without manual input, and it became an industry standard adopted by major film manufacturers. In , DX denotes as a code within the (Digital Imaging and Communications in ) standard, which facilitates the storage, transmission, and display of radiographic images. Defined in the DICOM controlled terminology since the standard's early development in the and formalized in Supplement 32 (1998), DX applies to images acquired via direct digital detectors, such as flat-panel systems, producing high-resolution projections without intermediate film processing. This distinguishes it from the () modality, which relies on photostimulable plates scanned by laser to generate digital images. DX systems support diagnostic applications in , enabling faster workflow and integration with picture archiving and communication systems for clinical review.

Vehicles and engineering

In automotive engineering, DX refers to the entry-level trim level offered by Honda for various vehicle models, particularly the Civic and Accord, starting in the 1980s. Introduced with the second-generation Honda Civic in the 1980 model year, the DX trim provided a basic configuration aimed at budget-conscious buyers, featuring a standard manual transmission, cloth upholstery, steel wheels with hubcaps, and minimal electronic features such as no power windows, locks, or air conditioning in the most stripped-down variants. For the Honda Accord, the DX trim debuted in the third generation for the 1986 model year, similarly emphasizing affordability with a focus on essential mechanical components like a carbureted engine, manual steering, and basic instrumentation, without luxury amenities. These trims were positioned as the most accessible entry points into Honda's lineup, prioritizing reliability and fuel efficiency over advanced features, and were available in sedan, hatchback, and coupe body styles across multiple generations. By the early 2000s, Honda began phasing out the DX designation in favor of the slightly more equipped LX trim as the new base model, reflecting evolving consumer expectations for standard safety and convenience features like anti-lock brakes and improved interiors; the DX was last used on models like the 2005 Civic before being discontinued. In mechanical engineering, particularly within heating, ventilation, and air conditioning (HVAC) systems, DX stands for Direct Expansion, a method where refrigerant flows directly through cooling coils to absorb heat from air via evaporation, without an intermediate chilled water loop. This approach, integral to vapor-compression refrigeration cycles, became a standard in residential and light commercial air conditioning units following the development of self-contained room coolers in the early 1930s, with the first window-mounted DX unit patented in 1931 by engineers H.H. Schultz and J.Q. Sherman. Unlike centralized chilled water systems that circulate cooled water to remote coils, DX systems integrate the evaporator coil directly in the air handler, enabling compact, decentralized designs suitable for smaller spaces and offering higher efficiency in direct heat exchange, though they require careful refrigerant management to prevent issues like uneven cooling. Common since the mid-20th century in split-system and packaged units, DX technology has been widely adopted for its simplicity and cost-effectiveness in applications ranging from home air conditioners to rooftop units, with ongoing advancements in refrigerants and controls improving energy performance.

Other uses in science, technology, and mathematics

In , denotes the hobby of detecting and logging distant radio signals, a pursuit that traces its origins to the 1920s amid the rapid expansion of wireless experimentation following . Practitioners, known as DXers, challenge propagation conditions and equipment limitations to achieve long-distance contacts, often documenting achievements in logs for verification. A prominent recognition for such efforts is the DX Century Club award, established by the in 1933, which honors operators who confirm two-way communications with at least 100 distinct countries or territories.

Other uses

Geography and transportation

In the , DX refers to the Document , a specialized for the secure transportation of documents, particularly in legal, medical, and business sectors. Established in 1975 amid Royal Mail strikes, it provides dedicated next-day delivery to a system of over 110 exchanges nationwide, bypassing standard postal services for faster and more reliable handling of sensitive materials. The network spans urban and semi-urban locations, enabling efficient document movement without reliance on conventional postcodes, though addresses incorporate DX numbers for routing. Doncaster in South Yorkshire serves as a key node in this system, with multiple DX exchanges supporting local legal operations in its , which encompasses both urban centers like the city itself and surrounding rural locales. Facilities such as the Magistrates' Court use designated DX identifiers, like DX 742840, to facilitate rapid inter-office and court document transport. This infrastructure aids professional workflows in the region, home to around 50,000 residents in its core districts, by integrating seamlessly with broader logistics operations. In railway contexts, DX denotes a prominent freight locomotive classification from the London and North Western Railway (LNWR). The DX Goods class, an steam design introduced in 1858 by Alexander Ramsbottom and later refined under Alexander Allan and Francis Webb, was built for heavy goods haulage on lines and sidings. Over 940 examples were constructed by 1903, marking it as Britain's largest single class and a cornerstone of 19th-century freight transportation due to its simple, mass-produced design and reliability in handling coal and merchandise trains. These DX locomotives exemplified early efforts in , contributing to the efficient movement of across England's heartlands before the widespread adoption of larger engines.

Radio and

In radio , DX is for "distance," originating from early 20th-century telegraphic used by operators to denote distant or long-distance transmissions. This abbreviation became integral to and practices as radio technology evolved in the , particularly for enthusiasts seeking to receive signals from far beyond normal propagation ranges. , the practice of tuning into such distant stations, gained popularity with the rise of , where signals in the high-frequency bands (typically 3 to 30 MHz) could travel thousands of kilometers via ionospheric reflection. The focus on shortwave bands below 30 MHz stems from their unique propagation characteristics, enabling signals to "skip" over the horizon and reach international audiences, a phenomenon central to global broadcasting during the mid-20th century. Stations like the and utilized these bands to transmit news and cultural programs worldwide, with DXers logging receptions as far as 10,000 kilometers away under optimal conditions such as solar activity peaks. In , DX often refers to contacts with entities outside one's own country, contributing to awards like the DX Century Club (DXCC) administered by the . Hobbyist organizations, such as the International Radio Club of America and the Worldwide DX Club, support through logs, contests, and equipment recommendations to enhance long-distance reception.

Miscellaneous uses

In printing contexts, duplex refers to double-sided printing or scanning, a feature integrated into multifunction devices starting in the to enhance efficiency in document handling.

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