n (typography) A printed symbol in the form of a solid circle, (•), often used for marking items in a list. (see also bulleted)
n (informal) An entire round of unfired ammunition for a firearm, including the projectile, the cartridge casing, the propellant charge, etc.
v (transitive|informal) To draw attention to (text) by, or as if by, placing a graphic bullet in front of it.