LOJBAN
I'm learning lojban with my girlfriend right now for many reasons, I think this language would be absolutely insanely wonderful for autistics, for a few reasons
- It's syntactically unambiguous, this means every sentence only has one meaning
- Attitudinals, at the start of your sentence, you actually state the tone it is meant to be interpreted in (you can see how that could be massive for autistic people alone)
- Text has the exact same meaning as the spoken language: Y'know how in english, you have to write punctuation marks? in lojban, those are words, meaning when combined with attitudinals, the written language has feature parity with the spoken language.