Underbar

A Parkour movement in which the traceur jumps through a small space- between two bars in a rail, for example, using his arms to glide through to the other side.

Many styles of underbars in this video:
http://www.youtube.com/watch?v=C3-CjE6dHIw

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Turn Vault

A Parkour movement in which the traceur plants his hands on a rail or obstacle and leaps over it, turning his body 180 degrees to end up in a reversed hanging position.

This move can be used to slow down before attempting a large drop or cat leap.

Good Tutorial of a Turn Vault by Ozzi:

http://www.youtube.com/watch?v=965PnBre_SA