In Brief: An attack that Sailor Moon unknowingly brought on in her first battle with a bad guy. Was only used once in the first episode of the anime and later on in the SuperS season. Shortly after using it she learnt her Moon Tiara Magic attack which was much more powerful thus her no longer having a need to use this one.

It was never given an official name in any media. "Sailor Scream" is simply my name for it. Feel free to use this name as well but make sure you tell people that it's not the official name for it.

Cultural: "If you scream in your dream, it means that you are finally expressing an emotion that you have been withholding."
-- Taken from Dream Dictionary

The Move: Sailor Moon began screaming. Eventually her red gems in her "meatballs" clicked on and began to amplify her screams, completely disabling the opponent.