An unusual thing can be described as a RARITY, ONER, ODDITY, NOVELTY, ANOMALY, or raravis. A RARITY is something that is not common and is hard to find. An ONER is an object that is unique and one of a kind. An ODDITY is something that is strange or out of the ordinary. A NOVELTY is something that is new and different. An ANOMALY is something that deviates from what is normal. Raraavis is a term used to describe something that is extremely rare and unusual.