(firearms) A mark stamped on a gun to show that it has been tested successfully.

(Australian rules football) A mark (or catch) that typically involves a player jumping up on the back of another player.

(anatomy, dated) birthmark

(idiomatic) To behave in an unacceptable or morally reprehensible way.

(cartooning, manga, anime) A cartoon icon; a symbol used to indicate emotion, movement, etc. in a drawing; especially one used in or associated with Japanese-style manga.

A dot, line, or other mark made with a pen onto paper.

(theology, eschatology) a mark on the person of worshippers of the Antichrist; without the mark one cannot buy or sell / (nautical, slang, archaic) The patches on the lapels of a midshipman's jacket.

(Australian rules football) A mark (catch) in which the player receives the ball into both arms at chest height.

(rail transport, US, Canada) A code of up to four letters allocated to and used by railroads and other owners of rolling stock for identification purposes, shown on each rail vehicle in combination with an individual number for the vehicle.

(UK, education, historical) A formal black mark given to a pupil for bad behaviour.