Tracer Bullet

Tracer Bullet or tracer bullet may refer to:
 * Tracer ammunition, bullets that are built with a small pyrotechnic charge in their base
 * Tracer Bullet, a fictional detective, alter ego of Calvin in the comic strip Calvin and Hobbes
 * A term used in Scrum (software development) to describe a proof-of-concept deliverable
 * Pathfinder (library science) - a term for those pathfinders produced by the Library of Congress.