Aside from the issue of choosing one, a lot of sign language includes making your hand into the sign for a letter (like a, b, c, etc..) and then doing further motions/signs, and the spelling of the word informs what letter you might use.
For instance, the sign for a Rhino is to make the R sign and then put it to your nose like a horn. But other languages call rhinos different things that might not start with an R, so that sign would make no sense.
There’s just a lot of stuff like that baked in that would not make sense unless there was already a shared base language.
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