| Acronym | Definition |
|---|
| PFO➣Patent Foramen Ovale (defect of the heart) |
| PFO➣Principal Federal Official (US DHS) |
| PFO➣Proxy Factory Object |
| PFO➣Product Function Optimizer |
| PFO➣Persistent Felony Offender (various states) |
| PFO➣Pyrolysis Fuel Oil |
| PFO➣Playing for Others (teen development program; Charlotte, NC) |
| PFO➣Pittsburgh Field Office (Pennsylvania) |
| PFO➣Pinedale Field Office (US DOI) |
| PFO➣Persistent Foramen Ovale (cardiology) |
| PFO➣Power Fail Output |
| PFO➣Paphos, Cyprus - International (Airport Code) |
| PFO➣Pissed Fell Over (UK medical slang for drunk patient) |
| PFO➣Profit From Operations |
| PFO➣Pyruvate:Ferredoxin Oxidoreductase |
| PFO➣Perron-Frobenius Operator |
| PFO➣Pinyon Flat Observatory (earthquake reporting station) |
| PFO➣Property and Fiscal Office |
| PFO➣Plutonium Finishing Operation |
| PFO➣Pink Floyd Online (fan site) |
| PFO➣Palustrine Forest (environmental science) |
| PFO➣Please Frig Off (polite form, as in a PFO letter for a refused resume) |
| PFO➣Paint Flag Offset (marking underground utilities) |
| PFO➣Project Formulation Office (NASA) |