plural of 1-up

(canoeing) A class of kayak for two seated people.

(video games) An item that grants the player an extra life in the game, staving off game over by one more try. / (video games) In a game with multiple players, an indicator or identifier of player 1.

The Garand semiautomatic rifle, also named the United States Rifle, Caliber .30, M1.

(computing) IBM Personal System/1

plural of 1-on-1

A laplet computer.

(computing, slang, humorous, derogatory) The computing company Microsoft.

(soccer) The highest division of professional football in France.

A puzzle similar to a Rubik's Cube that can change shape due to the way it is cut.