A device you use to hang something, like clothing, is a hanger. When your brother drops his jacket on the floor, you might remind him to put it on a hanger and hang it up in the closet.
Clothes and coat hangers are common, often made from metal or wood that's bent into a triangular shape. Other hangers include picture hangers and plant hangers — really, anything from which you can hang something is a hanger. A person who does the hanging — hanging your new wallpaper, for example — is another kind of hanger. Be careful not to confuse these hangers with a hangar, which is a garage where airplanes are kept.