Flap, in (archaic) computer science jargon, refers to the process for unmounting a magnetic tape. When the system operator commanded a tape drive to unmount a tape, it would rewind the medium and then, as the tape unwrapped from the take-up reel, it would go "flap-flap-flap" as the feed reel spun down.
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The main difference between a flap and a stop consonant is that in a flap, there is no buildup of air pressure behind the place of articulation, and consequently no release burst.
The symbol for the alveolar lateral flap is the basis for the expected (though not officially recognized) symbol for the retroflex lateral flap,
They include a bilabial flap in Banda, which may be an allophone of the labiodental flap, and a velar lateral flap as an allophone in Kanite and Melpa.
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