keycap

or key cap

[ kee-kap ]

noun

1. one of a set of covers for the individual keys on a computer keyboard, used decoratively or for some other purpose in place of those supplied by the manufacturer:

   What better way to spiff up your mechanical keyboard than to get a brand-new set of keycaps?

2. a cover for the head or wide top portion of the key to a lock, making the key easier to identify and to grip while turning in the lock:

   Our 4-pack of vinyl key caps includes one each in a variety of colors—for home, office, shed, or anything else you lock.

Word History and Origins

Origin of keycap¹

First recorded in 1900–05, referring to typewriter keys