super saiyan
A form exclusive to the Saiyan race in Dragon Ball Z and onward. In order to go Super Saiyan for the first time, one must be either full-Saiyan or half-Saiyan and have gone through months or years of rigorous training, and one must have a pure heart or pure purpose. At first, one must've experienced something that would send them into a moment of ultimate rage, but overtime that requirement was sidestepped.
On Danbooru, the tag indicates someone is going or already in Super Saiyan form, generally indicated by blonde, spiked hair, green eyes, and a jagged, golden aura.
Beyond Super Saiyan, there is also Super Saiyan 2, Super Saiyan 3, Super Saiyan God, and Super Saiyan Blue. Aside from those, in canon, there is also the SSJ-derived Super Saiyan Berserk and Blue-derived Super Saiyan Rosé, while in non-canon, there's Super Saiyan 4 and the Legendary Super Saiyan form.