Ⓟ

Symbol

 * 1)  water pumper
 * 2)  platinum ("platina", Daltonian symbol)
 * 3)  an unidentifiable/indeterminate plosive
 * Technically, this should be typeset as a black 'P' in a red circle.

Related terms
See for uses of a letter inside a circle.
 * 🄿
 * 🅟
 * 🅿