K comes from the Greek word kilo which means a thousand. The Greeks would likewise show million as M, short for Mega.

The letter 'k' in text messages is used as a shortened form of the word "Okay" or "OK". I personally avoid using it in my conversations because I find 'OK' a more suitable and clearer form of communication when it comes to it.

K is the unit symbol for the kelvin, used to measure thermodynamic temperature (note: degree sign is not used with this symbol). K is the chemical symbol for element potassium (from its Latin name kalium).

In late Latin and the early Romance period the unvoiced velar, represented by C, became palatalized before front vowels, and in the 12th century K was reintroduced as a substitute for C to represent the velar before front vowels since C did duty for both the velar and palatal in such cases and confusion was thus liable ...