RPN may be an acronym that refers to:Licensed practical nurse, also referred to as a Registered Practical NurseRadio Philippines NetworkRegistered Parameter Number, as used in Musical Instrument Digital Interface synthesizersRegistered psychiatric nurse Reverse Polish notation, a.k.a. Postfix notation, a mathematical notationRisk Priority Number, as used in Failure mode and effects analysis (FMEA) RPN may also refer to:RPN, the IATA airport code for Rosh Pina Airport, Israel RPn, Real projectiv… (More on Rpn)