Usually means: Device for remote access control.
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We found 7 dictionaries that define the word key fob:

General (3 matching dictionaries)
  1. key fob: Merriam-Webster
  2. key fob: Wiktionary
  3. Key fob: Wikipedia, the Free Encyclopedia

Computing (2 matching dictionaries)
  1. Webopedia (No longer online)
  2. key fob: Encyclopedia

Slang (1 matching dictionary)
  1. key fob: Urban Dictionary

Tech (1 matching dictionary)
  1. AUTOMOTIVE TERMS (No longer online)

Definitions from Wiktionary (key fob)

noun:  An item carried on a key ring either as decoration or for security.
noun:  A passive wireless electronic device that usually uses RFID technology to control access to buildings, containers, computers, etc. by being placed near a detector.
noun:  An active wireless electronic device that controls access to buildings or vehicles, such as a remote control for a car door lock.

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