English abbreviations from pie to pij
- PIE (pyrotechnically initiated explosive)
- PIEAS (Pakistan Institute of Engineering & Advanced Sciences)
- PIER (Public Interest Energy Research (CEC))
- PIF (Partners in Flight)
- PIFA (Pacific Islander Festival Association (San Diego))
- PIFC (Partners In Foster Care)
- PIFS (Point Inter- Frame Space)
- PIFUA (Powerplant and Industrial Fuel Use Act of 1978)
- PIG (Pipeline Inspection Gauge)
- PIGS (Paired Iowans Going Somewhere)
- PIGS (also PIIGS or PIIGGS) (Portugal, Italy, Greece, Spain; PIIGS if including Ireland; PIIGGS if including the United Kingdom (Great Britain))
- PIH (Pocatello Regional Airport)
- PIHA (Professional Inline Hockey Association)
- PIHCP (Pacific Island Health Care Program)
- PIHMS (Pacific International Hotel Management School)
- PIHRA (Professionals In Human Resources Association)
- PII (Program Image Inspector)
- PIII (Plasma Immersion Ion Implantation)
- PIJ (Palestinian Islamic Jihad)
