I style of "screaming" that involves sucking in air while putting pressure on your throat to make noise to sound like you're screaming. It is very rarely used by musicians because it will ruin your voice in a matter of months, and takes no talent whatsoever. It is basically fake screaming, and sounds horrible too.
Guy 1: Hey man, I learned how to screamo yesterday!
Guy 2: (In disbelief) Oh really? Let's hear it
(Guy 1 starts his inhale "screaming." Guy 2 commits suicide shortly afterward because inhale screaming takes no talent)