As Initials

• Chi Alpha, a Christian college group
• Extended addressing, a processor architecture first introduced by IBM in 1981 in the System/370
  System/370
  The IBM System/370 was a model range of IBM mainframes announced on June 30, 1970 as the successors to the System/360 family. The series maintained backward compatibility with the S/360, allowing an easy migration path for customers; this, plus improved performance, were the dominant themes of the...
  
   model 3081 mainframe computer
• eXtended Architecture, a standard for CD-ROM
  CD-ROM
  A CD-ROM is a pre-pressed compact disc that contains data accessible to, but not writable by, a computer for data storage and music playback. The 1985 “Yellow Book” standard developed by Sony and Philips adapted the format to hold any form of binary data....
  
   drives

Technology

• Scion xA
  Scion xA
  Scion xA is a five-door hatchback subcompact marketed in the US from 2004-2006 — as an export model of the Japanese Domestic Market Toyota ist. Based on the first generation Toyota Vitz hatchback, the xA shared a platform with the Toyota Platz sedan....
  
  , a car
• X/Open XA
  X/Open XA
  In computing, the XA standard is a specification by The Open Group for distributed transaction processing . It describes the interface between the global transaction manager and the local resource manager...
  
  , a distributed transaction processing specification
• Fantom-X, a synthesizer made by Roland Corporation
• Olympus XA
  Olympus XA
  The Olympus XA was a 35 mm rangefinder camera built by Olympus of Japan. It was one of the smallest rangefinder cameras ever made, together with the Contax T.It was designed by Yoshihisa Maitani who had joined Olympus Optical Co Ltd in 1956...
  
  , a camera
• a Maxis proprietary audio format for The Sims
  The Sims
  The Sims is a strategic life-simulation computer game developed by Maxis and published by Electronic Arts. Its development was led by game designer Will Wright, also known for developing SimCity...
  
   and SimCity 3000
  SimCity 3000
  SimCity 3000 is a city building simulation personal computer game and the third major installment in the SimCity series. It was published by Electronic Arts and developed by series creator Maxis, a wholly owned subsidiary of EA...
  
  . Decoding is supported by FFmpeg
  FFmpeg
  FFmpeg is a free software project that produces libraries and programs for handling multimedia data. The most notable parts of FFmpeg are libavcodec, an audio/video codec library used by several other projects, libavformat, an audio/video container mux and demux library, and the ffmpeg command line...
  
  
• ".xa". or ".XA", audio file extensions used in PlayStation
  PlayStation
  The is a 32-bit fifth-generation video game console first released by Sony Computer Entertainment in Japan on December 3, .The PlayStation was the first of the PlayStation series of consoles and handheld game devices. The PlayStation 2 was the console's successor in 2000...
  
  and PSone