Assistance request- anyone here have experience with deaf cats?

[biophile]

I have two (hopefully) foster kittens. I say hopefully because I might end up keeping them. 😏 They are now about 6-7 weeks old. They are from a restaurant- momma cat had four kitttens in the ceiling. Staff caught two on Easter weekend but them momma moved the other two to an unknown location. They are white with grey tails and their eyes have stayed blue, so classic coloring for deafness.
My question is - are there universal hand signals for deaf cats to indicate “come”, “dinner”, “pets”, “no”? Any other tips for helping deaf cats navigate the world? These guys are young and very trainable; I’d like to do it right.