is there a lingua franca (or close to lingua franca) for sign language? Like english for example can get you far wherever you dont speak the language, so is there a counterpart to in in the sign language world?
well, there’s International Sign, which is similar to Esperanto in that it’s a language specifically created for international cooperation, except it’s a really successful language and is used at a lot of international events, like the Deaflympics, international Deaf chess tournaments, and WFD meetings
lingua franca-wise I’d say International Sign is the closest you’ve got
if you’re thinking ‘which sign language do I learn?’ the answer is the one of the community you’re in. Languages are meant to be for communication, not bragging rights