WordNet (r) 3.0 (2006):

kibibyte
    n 1: a unit of information equal to 1024 bytes [syn: kilobyte,
         kibibyte, K, KB, kB, KiB]

The Free On-line Dictionary of Computing (30 December 2018):

kibibyte

    The official ISO[?] name for 1024 bytes, to
   distinguish it from 1000 bytes which they call a kilobyte.
   "Mebibyte", "Gibibyte", etc, are prefixes for other powers of
   1024.  Although this new naming standard has been widely
   reported in 2003, it seems unlikely to catch on.

   (2003-09-27)