kb

1. (etc.) A set of keys used to operate a typewriter, computer etc.
2. A component of many instruments including the piano, organ, and harpsichord consisting of usually black and white keys that cause different tones to be produced when struck.
3. A device with keys of a musical keyboard, used to control electronic sound-producing devices which may be built into or separate from the keyboard device.

noun

A unit of pressure equal to 1,000 bars (Symbol: kb)

1. A length of double-stranded DNA containing two thousand nucleotides, one thousand on each strand
2. A length of single-stranded RNA containing one thousand nucleotides

1. 1000 bits (binary digits)
2. 1024 (210) bits