What is the name for bikes for disabled people?

There's no specific name for bikes for disabled people, if nothing else different disabilities would need different different kinds of adaptations to make it possible for them to ride. Foot/ lower leg amputees can ride bikes with very little changes. Hand/arm amputees require a bit more to get brakes/shifters to work.

Then there are the different versions of trikes which would be useful if you have problems balancing. These can be both uprights and recumbents(=seated)

But able-bodied people ride those too, for various reasons, so they're not considered as bikes for disabled.