What's the name of this form of sliding down a rope? (In French: Tyrolienne)?

Question

What is the English name for the act of, while in climbing gear, attaching one-self to a rope with a device that will slide along it in order to get across from one platform to another with little incline?
In French it's called a Tyrolienne.
A picture of said practise can be found here:
http://wwwedu.ge.ch/po/calvin/disciplines/Gymnastique/oc_sport_2002_2004_3e/images/rappel02.jpg
Easy 2 points, 10 to the first person :)

I found out it's called a zip rope.

Answer 1

I do believe it's called Rappelling