Is the sign for "fist" the same as the letter "S"?
Yes, the handshape is identical to the ASL letter "S". The difference lies in the context and movement. When signing "fist," you are using the handshape as a literal visual representation of a fist, rather than spelling a word.
Do I use one hand or two hands for this sign?
You typically use just your dominant hand to show a single fist. However, if you are describing someone raising both of their fists, you would use both hands to accurately reflect that specific visual.
How is this different from the sign for "punch"?
While "fist" just shows the static handshape, "punch" involves an active, forceful forward motion. To sign "punch," you would thrust your fist forward, often hitting the open palm of your non-dominant hand to demonstrate impact.