swipe card
noun
plural swipe cards
: a plastic card with a magnetic strip that has encoded information which can be read when the card is slid through an electronic card-reading device
… announced proposals to introduce electronic swipe cards for regular, pre-screened travelers that would allow them to bypass lengthy passport lines.—Harvey Morris
… specialists were able to trace the messages to a remote location on campus and match their posting times to those when a certain student used his campus swipe card to get in and out of the same building.—Barrett Seaman
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Merriam-Webster unabridged
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