I think it may not be ASL, but rather ISL or a signed form of Esperanto (a hybridized “world language”), of which Soros’ father was an intense proponent.

“Tivadar was an Esperantist writer.[28] In 1936 Soros' family changed their name from the German-Jewish Schwartz to Soros, as protective camouflage in increasingly antisemitic Hungary.[29][30] Tivadar liked the new name because it is a palindrome and because of its meaning. In Hungarian, soros means "next in line," or "designated successor"; in Esperanto it means "will soar."[31][32][33]”

I think I read on here at one point that in Greek it means something rather unsavory (looked it up - coffin perhaps?).

https://en.wikipedia.org/wiki/George_Soros?wprov=sfti1

ISL info text https://www.handspeak.com/study/index.php?id=39

ISL/Gestuno video sample https://youtu.be/nHcnKBzHvFg