gripper

noun6

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

   • To move the options bar from its default location at the top of the screen to a new location, click the gripper on the option bar's left edge and drag it to its new location. — 2004
5. •
   [usually plural] (slang) A foot.

   • Put those grippers away!
6. •
   (slang) A ticket collector.