All articles starting with X

X2 (film)

X2 (X2: X-Men United) is Bryan Singer's 2003 X-Men sequel in which Stryker abducts Xavier and the X-Men ally with Magneto. Released May 2, 2003; $407.7M worldwide; Saturn Award winner.

The X2 interface is the 3GPP-defined logical interface connecting neighboring eNodeBs directly within LTE networks, used mainly for handover, plus interference coordination, load management, and multi-cell radio resource functions.

Oct 3, 2026

X2: X-Men United

X2: X-Men United (2003), also called X2, is Bryan Singer's second X-Men film, written by Zak Penn and David Hayter. Stryker (Brian Cox) attacks the X-Mansion; Magneto allies with the X-Men. It grossed $407.7 million and scored 85% on Rotten Tomatoes.

X3D

X3D (Extensible 3D) is an open, royalty-free ISO file format and run-time architecture for interactive 3D scenes over networks, developed by the Web3D Consortium as VRML's enhanced successor.

x402

x402 is an open payment protocol created by Coinbase and governed by the x402 Foundation, reviving HTTP 402 to attach stablecoin payments to web requests.

Oct 10, 2026

X5 Group

X5 Group is Russia's largest food retailer by revenue, operating the Pyaterochka, Perekrestok, and Chizhik chains; in 2024 it ran 27,015 stores with a 15.6% market share.

X68000

The X68000 was a 16-bit home computer made by Sharp Corporation and sold only in Japan from 1987, known for arcade-quality game ports and its twin-tower case.

X7 Barracks

X7 Barracks, Dura-Europos: Roman military barracks in Block X7, Syria, reworked from private houses X7-A and X7-B around a temple, part of the garrison base occupying a quarter of the city until the Sasanian sack c. AD 256.

X70 pipeline steel

X70 pipeline steel is a high-strength low-alloy linepipe grade in the API 5L specification, with a 485 MPa minimum yield strength, used in long-distance natural gas pipelines.

X86

X86, also known as the Intel x86 architecture, is a family of instruction sets first developed by Intel with the 16-bit 8086 processor of 1978. It underlies most PCs and many servers.

X86 assembly language

X86 assembly language is the human-readable form of machine code executed by x86 processors, a CISC architecture begun with Intel's 8086 and extended through 32-bit IA-32 and 64-bit x64.

X86 calling conventions

X86 calling conventions are the rules for how functions pass arguments, use registers, return values, and clean the stack: 32-bit x86 has several conventions, while 64-bit consolidated into Microsoft x64 and System V AMD64.

X86 instruction listings

X86 instruction listings, covering the x86 instruction set, are catalogs of machine instructions for Intel, AMD, and compatible processors, with mnemonics, encodings, and operand effects.

X86 virtualization

X86 virtualization is the hardware and software techniques that allow multiple isolated operating systems to run on one x86 or x86-64 processor, using Intel VMX and AMD-V extensions.

X86-64

X86-64, known as AMD64 or Intel 64, is a 64-bit extension of the x86 instruction set designed by AMD, first shipped in the 2003 Opteron.

Xaa-Pro dipeptidase

Xaa-Pro dipeptidase (prolidase, EC 3.4.13.9, pepQ) is a Mn2+-activated M24 metallopeptidase hydrolyzing Xaa-Pro dipeptides such as collagen-derived Gly-Pro; deficiency causes ulcerative dermatitis.

Xabi Alonso

Xabi Alonso (Xabier Alonso Olano), Spanish midfielder-turned-manager, born 1981. World Cup and two-time Euro winner with Spain; Champions League with Liverpool and Real Madrid. Led Bayer Leverkusen to an unbeaten 2023/24 Bundesliga and cup double, then managed Real Madrid and Chelsea.

Xàbia

Xàbia (Jávea), coastal municipality in Marina Alta, Alicante, Spain, on the Costa Blanca. Three nuclei (old town, port, Arenal); 30,817 residents in 2025, 47.46% foreign, fifth in Spain; Montgó Natural Park and 25 km coast.

Xabier Fernandez

Xabier (Xabi) Fernández Gaztañaga, Spanish sailor born 1976 in Ibarra, Gipuzkoa; 49er crew for Iker Martínez, Olympic gold Athens 2004 and silver Beijing 2008, three world titles, Volvo Ocean Race and America's Cup veteran, now a coach.

Xacro

Xacro (XML Macros) is an XML macro language used in the Robot Operating System to generate URDF robot descriptions, letting authors write repeated robot structure once as reusable macros.

XAG (company)

XAG, or Guangzhou Jifei Technology Co., Ltd., is a Chinese agricultural robotics company founded in 2007 and headquartered in Guangzhou, making agricultural drones and rovers.

xAI

xAI was an artificial-intelligence company founded by Elon Musk in 2023, best known for the Grok chatbot family and the Colossus supercomputer, later acquired by SpaceX in 2026.

XAI (company)

xAI is an American artificial intelligence company founded by Elon Musk in 2023, known for the Grok chatbot and its Colossus supercomputing data centers in Tennessee.

xAI 2025 funding rounds

xAI's 2025 funding rounds were equity and debt raises by Elon Musk's AI company, lifting its valuation from $80 billion in March 2025 to about $230 billion.

xAI Colossus

xAI Colossus is the AI training cluster that Elon Musk's company xAI built in Memphis, Tennessee, starting in 2024, in 122 days, powered partly by unpermitted gas turbines.

xAI Series E

The xAI Series E was a $20 billion funding round announced by Elon Musk's AI company xAI on January 6, 2026, its largest raise to date.

xAI–SpaceX merger

The xAI–SpaceX merger is SpaceX's February 2026 acquisition of Elon Musk's AI lab xAI, combining xAI, Starlink, and X into a company valued at about $1.25 trillion.

xAI–X Corp merger

The xAI–X Corp merger, announced March 28, 2025, was an all-stock deal in which Musk's AI startup xAI acquired X, the platform formerly known as Twitter.