Ponytail

A ponytail is a hair style in which a person's long hair (usually in the back) is tied together and extrudes like a horse's tail.

Empath: The Luckiest Smurf stories
In the EMPATH: The Luckiest Smurf story series, Sassette switched to wearing her hair in a ponytail that sticks out from the top instead of from the back, thus excluding herself from wearing the Smurf hat. On some occasions, Smurfette would wear her hair in a ponytail that sticks out from the back, though she continues to wear the Smurf hat while doing so.