Tail

Tail is an iconic sign, as it mimics the wagging of an animal's tail. Take your non-dominant hand and form it into a fist as it sits on top of your dominant wrist. Now take your dominant hand and form a loose fist while keeping your index finger out. Wag this pointer finger back and forth, like an excited dog or cat wags its tail.

Tail is signed a bit like reptile, so be careful not to get these signs confused.