RPN

RPN may refer to:

Science and technology

• Real projective space (Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle \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, a state-sequestered television network
• Rosh Pina Airport (IATA code), Israel
• Rancangan Perumahan Negara (National Housing Programme), public housing in Brunei