Power-up

"Power-ups" give you an advantage over the other players in a multiplayer battle in Halo: Combat Evolved, Halo 2 and Halo 3. On a few occasions, they're also found in Campaign. You activate them by walking into them and, unlike Equipment, which is not activated instantly and can be held for use later.

Trivia

 * The Custom Powerup's default settings increase you speed and melee power. It has been speculated this was to be the effects of a unused Agility Powerup.