Relic

Relic item's are defined as such beside the slot equip type.

A Relic is a unique item, they are usually named items that drop from powerful foes. They tend to be some of the best items in the game. You can only equip 1 of any Relic on your character, so if you have 2 of the same relic rings you can only use one, give the spare to a sim player or sell it.