Marker
Marker , noun
(Military) One who or that which marks.
(a)
(Military) One who keeps account of a game played, as of billiards.
(b)
(Military) A counter used in card playing and other games.
(c)
(Military) The soldier who forms the pilot of a wheeling column, or marks the direction of an alignment.
(d)
(Military) An attachment to a sewing machine for marking a line on the fabric by creasing it.