Someone or something that creates marks, particularly • A felt-tipped pen, a marker pen. • A scorekeeper, especially one who tallies billiard scores. • A device that fires a paintball. • Someone or something used to mark a position or amount, particularly • A real or virtual objective, something to be aimed for. • A location on a stage or set where an actor is to stand or move to during a scene, usually indicated by a small X design placed on the floor. • A direction issued by a camera operator for actors to be on their locations in readiness for a take. • Synonym of IOU, an informal record of a debt. • A free or bound morpheme indicating a grammatical function. • Ellipsis of discourse marker. • A gene or DNA sequence with a known location on a chromosome that can be used to identify individuals or species. • A substance used as an indicator for diagnosis or other analysis, a biomarker. • The soldier who forms the pilot of a wheeling column or marks the direction of an alignment. • A sewing machine attachment that creases the fabric to mark a line • A counter, especially one used in card games or backgammon. • Any of various objects that mark a place on the landscape, such as a milepost, blaze, or surveyor's cairn. • Someone who assigns marks on tests, examinations, etc.; a grader. • The ink marks or residue of a felt-tipped pen. • A personal favor owed to someone, whether written or not. • A formal certification that a company was the first to approach a competition authority to reveal the existence of a cartel, generally entitling it to greater leniency during the cartel's dissolution and punishment. • A player on defense used to mark one or more offensive players. • A player employed by a private club to compete against members. • A point, unit of scoring in a game or competition.