I 🫶 all these questions!

I've picked up a few signs from other signed languages (a few Japanese signs, a few Hawaiian, and the Australian Sign alphabet (2-handed alphabet).

Though I'm not an expert in any of the world's other signed languages, I do think they all follow the 5 Parameters (all languages need "guard rails"/limitations in order to make sense- Chinese Sign, French Sign, and all the rest, must certainly follow such rules.

Chinese Sign *does* use fingerspelling- many of the HANDSHAPES are the same as ASL, however, there are some differences in PALM ORIENTATION (and meaning!). Also the Chinese Sign alphabet represents Chinese sounds that English doesn't have, so these are particular to CSL (example: https://youtu.be/3ZJBzhbYjAU?si=d3xALA_0tyYuI5M1 )

All signed languages must use facial expressions, however, what these facial markers *mean* in each individual signed language can differ.

As for a signed language that utilizes only one-hand, exclusively... I've never seen one! But, I've interpreted for a Deaf client who had 4 out of 5 fingers amputated (that was a difficult interpreting gig!!)

I hope I answered some of your questions!!🤙