A lavatory faucet is a type of faucet that is used in a bathroom. The term is generally used in reference to a faucet that is mounted on the sink, though lavatory faucets may also be mounted on the wall or the back of the toilet. Lavatory faucets are typically made of metal or plastic. They may have a lever handle or a single-lever handle. The term is also used in reference to faucets that are used in lavatories.