RPN may be an acronym that refers to: Licensed Practical Nurse, also referred to as a Registered Practical Nurse Radio Philippines Network Registered Parameter Number, as used in MIDI synthesizers Registered Psychiatric Nurse Reverse Polish notation, a.k.a. Postfix notation, a mathematical notation Risk 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 projective space, in mathem… (More on Rpn)