RPN

RPN may refer to:

Science and technology

Real projective space ( $\mathbb {R} \mathrm {P} ^{n},$ ), a type of topological space
Reverse Polish notation, a.k.a. postfix notation, a mathematical notation
Registered Parameter Number, in MIDI
Recherche en Prévision Numérique, weather forecasting research service, Canada
Risk priority number in failure analysis such as FMEA, taking into account the severity, probability and detection probability of a failure event

Nursing

Registered practical nurse, nursing title
Registered psychiatric nurse, nursing title specialising mental health

Other uses

Radio Philippines Network, Channel 9
Rosh Pina Airport (IATA code), Israel
Rancangan Perumahan Negara (National Housing Programme), public housing in Brunei

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