| Acronym | Definition |
|---|
| PN | Pan |
| PN | Part Number |
| PN | Product Name |
| PN | Panama (including Canal Zone Region) |
| PN | Postnuke (website content management sytem) |
| PN | Pordenone (Friuli Venezia Giulia, Italy) |
| PN | Pitcairn Island (top level domain) |
| PN | Peanut |
| PN | Peripheral Neuropathy |
| PN | Public Nudity |
| PN | Practical Nurse |
| PN | Pinot Noir (wine) |
| PN | Project Number |
| PN | Petri Net |
| PN | Planetary Nebula |
| PN | Pseudo-Noise |
| PN | Platoon (Canadian/British) |
| PN | Parques Nacionales (National Parks Administration, Argentina) |
| PN | Program Neighborhood (Citrix Client Software) |
| PN | Promissory Note |
| PN | Phase Noise (communication systems) |
| PN | Polska Norma (Polish: Polish Standard) |
| PN | Practice Nurse |
| PN | Partit Nazzjonalista (Nationalist Party, Malta) |
| PN | Partido Nacional (Spanish: National Party) |
| PN | Protease Nexin |
| PN | Play Nice (gaming) |
| PN | Noise Power |
| PN | Personal Needs |
| PN | Polish Notation (aka prefix notation) |
| PN | Peer Networking |
| PN | Pacific National (Australia) |
| PN | Philippine Navy |
| PN | Pakistan Navy |
| PN | Pneumonic |
| PN | Participating National (FCC) |
| PN | Property Number |
| PN | Predicate Nominative |
| PN | Procurement Notice |
| PN | Participatory Note |
| PN | Proportional Navigation |
| PN | Paso A Nivel (Spain) |
| PN | Pressure Number |
| PN | Perfect Nonlinear |
| PN | Preliminary Notification |
| PN | Planet Namek |
| PN | Position Navigation |
| PN | Problem Notification |
| PN | Percussion Note |
| PN | Prominent Nuclei |
| PN | Positive Notification |
| PN | Polemiko Nautiko (Greek Navy) |
| PN | Pedigree Nursery |
| PN | US Postal Note (Scott Catalogue prefix; philately) |
| PN | Pseudorandom Noise/Number |
| PN | (USN Rating) Personnelman |
| PN | Petitioner Name |
| PN | Poikiloderma with Neutropenia |
| PN | Piedmont and Northern Railway Company |
| PN | Periodic Nonharmonic |
| PN | Positive-channel, Negative-channel junction (electronics, semiconductors) |