the name for a tool, or form of ID
It is not an acronym nor an abbreviation, nor any kind of online shorthand, it is the given name to the device that people often have on their key chains to give them entry access to a building. A fob may be symbolic or strictly aesthetic, and it can also be a form of ID or a small tool. Many fobs are small flashlights, compasses, calculators, penknives, store discount cards, bottle openers, or USB flash drives.
NetLingo Classification: Acronyms and Text Message