Gorget

Noun

1. A piece of armour protecting the throat and/or the upper part of the chest.
2. A crescent-shaped ornamental metal plate suspended around the neck from the crescent's points by a length of chain or ribbon, used to indicate rank or authority and was worn as part of a dress military uniform by officers.
3. A type of women's clothing covering the neck and breast; a wimple.
4. An ornament for the neck; a necklace, ornamental collar, torque etc.
5. A cutting instrument used in lithotomy.