For an explanation of "classifiers" in general, see:
CLASSIFIERS
The "S" handshape can be used to show objects that are round and
"ball-like."
Cl:S is also used to show how things are grabbed, pulled, and pushed.
Examples: A head, breasts, testicles, a ball
Grabbing and lifting the door of a hatchback car.
Pulling out a drawer.
Pulling on a rope.
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Also
see: CLASSIFIERS
Also see: THICK