kB

from WordNet (r) 3.0 (2006)

kb
    n 1: a unit of information equal to 1000 bits [syn: {kilobit},
         {kbit}, {kb}]
    2: a unit of information equal to 1000 bytes [syn: {kilobyte},
       {K}, {KB}, {kB}]
    3: a unit of information equal to 1024 bytes [syn: {kilobyte},
       {kibibyte}, {K}, {KB}, {kB}, {KiB}]

from The Free On-line Dictionary of Computing (8 July 2008)

kilobyte
KB

   <unit> (KB) 2^10 = 1024 {bytes}.

   See {prefix}.

   (1995-09-29)

from V.E.R.A. -- Virtual Entity of Relevant Acronyms (June 2006)

KB
       KiloByte