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A bullet was a projectile propelled by a firearm. Most bullets were made from a type of metal.
By the late 24th century, weapons that fired bullets were relatively rare. In 2375, when three Starfleet officers on board Deep Space 9 were killed with tritanium bullets, Chief Miles O'Brien pointed out that one didn't see bullets every day. (DS9: "Field of Fire").
Captain Jean-Luc Picard also used bullets to kill two Borg on the holodeck by using a holographic Tommy gun before they could adapt. (Star Trek: First Contact)