I was reading this tip on my Halo 3 guide. It said to find a certain skull on the Covenant. I had to climb up this pathway at the 2 tower, turn left, then do a "180". How am I suppose to do a 180?
"Do a 180" means to turn around. Specifically, turn 180 degrees, which is a half-circle. A 360 is therefore turning completely around to face the same way as you started.