The abbreviation KB or kb can refer to:
Kilobit (kb), a unit of information used, for example, to quantify computer memory or storage capacity.
King's Bounty, a 1990 computer game by New World Computing, or King's Bounty: The Legend, its 2008 sequel.
Keyboard, a data entry device or musical instrument.
Kilo-base pair (kb or kbp), a unit of measurement of DNA or RNA length used in genetics, equal to 1,000 nucleotides
Boltzmann constant (kB), the physical constant which relates temperature to energy
People, that are listed by Wikipedia:
* Kobe Bryant, professional basketball player
* Kurt Busch, NASCAR driver
* Kristen Bell, actress who stars in TV series Veronica Mars
* Kevin Bartlett, a former Australian rules footballer and coach
My pick would be:
Boltzmann constant (kB), the physical constant which relates temperature to energy.
http://en.wikipedia.org/wiki/KB