gripper

Short definition from Wiktionary

Noun

1. 1
   A person who or thing which grips something.
2. 2
   A cover on a handle that makes it easier to grip.
3. 3
   A rubber or other material attached to a curling shoe to improve traction on the ice.
4. 4
   A ticket collector.
5. 5
   A visual component on a window etc. enabling it to be resized and/or moved.
6. 6
   A foot.