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The term fob originated in the late 1800s and refers to an ornament on a pocket-watch chain. Today a fob refers to a variety of small electronic devices, including USB drives, authentication tokens, remote car starters and garage door openers. See USB drive, USB dongle and authentication token.

The Keyless Entry Fob
For years, opening car doors with the fob has been standard equipment.
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Abbr. for “free on board.”
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
References in periodicals archive ?
When Brighton teenager Zack showed up in a vintage-style beige-and-white pinstriped suit, accessorized with a small-brimmed straw hat and a double-Albert fob chain, she was a little taken aback.
Kwis Ewbank, growing madder than the March hare, donned monocle and watch fob chain to announce his comeback in Egypt.