The crescent kick is a kick where the leg comes at an arc from the inside or outside. In Korean it is called ‘bandal chagi’.
Taekwondo Kicks : Taekwondo Crescent Kicks
The crescent kick can easily be performed in reverse.
Taekwondo Kicks : Taekwondo Reverse Crescent Kick
A 540 crescent kick.
Tae Kwon Do 540 Kick : Tae Kwon Do 540 Crescent Kick