Kibibyte

A kibibyte is 1024 bytes. Please don't get it confused with a kiwibyte or a pibbybyte.

A kilobyte was originally defined as 1024 bytes (10000000000 in binary); I guess it was close enough to 1000 they thought it would be fine to use the prefix "kilo" which means one thousand. But I guess different people took it to mean 1000 or 1024 bytes, so then standardization came along and decided that kilobyte would refer to 1000 bytes only (so it was consistent with all other uses of the prefix), and kibibyte would refer to 1024 bytes. The "bi" came from the fact that 1024 is a round number in binary and binary starts with bi because it is attracted to all genders. This also continues through the rest of the byte series with mebibytes, gibibytes, tebibytes and so on all being increasing powers of 1024. Also look at this page's size in bytes its pretty funny i think.