K

(law, informal) Abbreviation of contract.

(education, US) Abbreviation of kindergarten.

(often computing) Abbreviation of kilo-, 1,024.

(computing) A single character message used as an acknowledgement (ACK), meaning "previous message received and understood."

(Morse code) Abbreviation of go ahead, over, an indication that a message is complete and a reply is awaited.

(baseball) Abbreviation of strikeout. On a baseball scorecard, a frontwards K signifies striking out while swinging the bat, while a backwards K signifies striking out while looking.

(card games, chess) Abbreviation of king.

(biology) Abbreviation of carrying capacity.

(geology) Abbreviation of Cretaceous.

(slang) Short for OK.

(knitting) Abbreviation of knit.

(slang) Abbreviation of ketamine (a drug).

(music) Abbreviation of Köchel number.

(UK, government) Abbreviation of Knighthood.

(economics) Abbreviation of capital.

(printing) Abbreviation of black.