Forth uses ``, and can do block comments with ( and ), except ) is optional in interpreted mode.
Algol 60 used ¢. ¢ isn’t even in ASCII, so god knows how that “your two cents” joke ever happened. How can a language this boring still exemplify how all programmers are dorks?
Visual Basic uses ’ because go fuck yourself. QBASIC origins or not, I don’t know how this shipped without at least one meeting where somebody got stabbed. Even the Systems Hungarian heretics should have recoiled in horror.