Ko , the japanese sound in a name meaning child.

the ISO 639 alpha-2 code for the Korean language

Knight Online, an online role-playing game

Koh of Sorcerer Hunters

Knock-Off, used in discussions about counterfeit toys

the stock ticker symbol for Coke, The Coca-Cola Company

Strikeout, in baseball, traditionally abbreviated KO or K

Kou Uraki of Gundam 0083

Knockout, in martial arts and boxing

Kilooctet, a unit of information or computer storage

Ko or dagger-axe, an ancient Chinese weapon

the IATA airline designator for Alaska Central Express

Ko (kana), the Romanisation of the Japanese kana こ and コ

Ko Simpson, a professional American football player for the Buffalo Bills.