kunci.

lock, something used for fastening, which can only be opened with a key or combination

key an object designed to open and close a lock

key a crucial step or requirement

key in musical theory, the total melodic and harmonic relations, which exist between the tones of an ideal scale, major or minor; tonality

key in musical theory and notation, the tonality centering in a given tone, or the several tones taken collectively, of a given scale, major or minor

key a value that uniquely identifies an entry in a container

key a piece of information (e.g. a passphrase) used to encode or decode a message or messages

key a password restricting access to an IRC channel

key answer key, an assorted list of solutions to problems or exercises in a test, textbook, etc.

clef, a symbol found on a musical staff that indicates the pitches represented by the lines and the spaces on the staff

chord, a harmonic set of three or more notes that is heard as if sounding simultaneously

spanner, wrench: a hand tool for adjusting nuts and bolts