Sarah Marie Parker-Allen wrote:
> or somewhat independent (like ASL)

ASL is actually related, not to English, but to French Sign Language.

> If so, how would you record it

There is a form of writing that's been devised for sign languages.  Like
spoken languages, sign languages are based on a finite number of
elements.  In spoken languages, they're sounds, in sign languages,
they're basic hand shapes, hand orientations, movements, posture, etc.
IIRC, ASL has a little of 50 of these basic units.  Thus, it is possible
to create characters for each of these basic units.

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