A canopy is a type of overhead roof or else a structure over which a fabric or metal covering is attached, able to provide shade or shelter from weather conditions such as sun, hail, snow and rain. They are frequently found at bus shelters and train station platforms. A canopy can also be a tent, generally without a floor. The word comes from the ancient Greek κωνώπειον, from κώνωψ, which is a bahuvrihi compound meaning "mosquito". The first 'o' changing into 'a' may be due to influence from the place name Canopus, Egypt thought of as a place of luxuries.