There’s also Exact English, which is different from ASL.
But why wouldn’t there be “foreign” sign languages? The whole “hearing” world doesn’t speak the same language; why would the whole deaf/hard-of-hearing world? Globalism? No thanks.
You’re kidding, right??? OMG!...it’s SIGN LANGUAGE! Of course we don’t SPEAK the same WORDS, but ACTIONS could be formed as universal.....sorry if “Global” triggered you....geesh...omg....what has happened here.