Ok, don’t care if I get downvoted for this. WTF is Solid? Would it hurt so much for people to include some sort of description of what something is when they

Ok, don’t care if I get downvoted for this. WTF is Solid? Would it hurt so much for people to include some sort of description of what something is when they apparently just outright steal an English word because they can’t think of a better name. I’m not going to Google that out of principle.