A pacifier or binky or piece or bo-bo or nookie (North American English), ummy or comforter (British, New Zealand, and Australian English) or soother (Canadian and Irish English), is a rubber, plastic, or silicone nipple given to an infant or other young child to suck upon. In its standard appearance it has a teat, mouth shield, and handle. The mouth shield and/or the handle is large enough to avoid the danger that the child chokes on it or swallows it.