AK

Noun

 * 1) an AK-47, AK-74, or related assault rifle (Avtomat Kalasnikova or Kalashnikov)
 * 2)  Any assault rifle or machine gun.

Noun

 * 1)  often found on concert or event tickets indicating a price that has to be paid at the venue at the evening of the event, as opposed to a presale ticket price

Proper noun

 * 1)  Council of Europe.