- noun a chamber-pot, potty, toilet. Now a dated nursery word, po was used by adults until the 1960s. The word is an imitation of the french pronunciation of pot (de chambre).
- chemical symbol forpolonium (written as Po)
- acronym forprincipal-only strip (written as PO)
- acronym forpetty officer (written as PO)
- acronym forpilot officer (written as PO)