Legendary

Legendary is a supertype that can be found on Artifacts, Creatures, Enchantments and Lands.

From the Comprehensive Rules:

• 205.4c Any permanent with the supertype “legendary” is subject to the state-based effect for legendary permanents, also called the “Legend rule” (see rule 420.5e).

• 420.5e If two or more legendary permanents with the same name are in play, all are put into their owners’ graveyards. This is called the “legend rule.” If only one of those permanents is legendary, this rule doesn’t apply.

See also "Legend rule".