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The initials RPN may refer to:
- Registered Practical Nurse, also referred to as a licensed practical nurse
- Radio Philippines Network, Channel 9, Philippines
- Registered Parameter Number, as used in Musical Instrument Digital Interface 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
- Recherche en Prévision Numérique, a numerical weather prediction research center in Canada
RPN may also refer to:
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