Ledge Jump

A Ledge Jump or Ledge Jumping is a small physics glitch in Halo 3 where just after you run over the edge of something, such as the top of a wall (without anything stopping you running over the edge) you perform a jump, and you will most likely reach a place you would normally fall short of.

Tutorial
Run over an edge without stopping. Rather then jumping just at the edge, wait a fraction of a second, then jump and continue moving forward. You should jump just after falling off the edge. This is particularly useful around ramps in The Pit, where normally you would jump off a ledge, just miss another ledge or ramp, and have to jump again or go back to a ramp.