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EAX may refer to:

  • EAX mode, a mode of operation for cryptographic block ciphers
  • EAX register, a 32-bit processor register of x86 CPUs
  • Environmental Audio Extensions, a number of digital signal processing presets for audio, found in Sound Blaster sound cards
  • GTD-5 EAX, class 5 digital telephone switch typically used in former GTE service areas