What does PF stand for?

Amer First Prep Fd 2 L.P. - AMEX symbol

American First PREP - Preferred Real Estate Participation Fund 2 Ltd. - AMEX symbol (SPSG)

Frankford Public Library, Frankford, PA - Library symbol - Library of Congress (LCLS)

French Polynesia - ANSI two-letter standard code (CNC)

frigate-patrol escort vessel (SAUS)

L-Phenylalanine Mustard and 5-Fluorouracil - Antineoplastic drug regimen (DAVI)

Pacemaker Failure (MELL)

Pacifica Foundation (EA)

Package Freighter - Shipping

Packaging Facility (SAUS)

Packing Factor (EECA)

Packing Fraction (EECA)

Paderewski Foundation - Defunct (EA)

Pagan Federation - United Kingdom (EAIO)

Page Fault (IAA)

Page Footing (BUR)

Page Formatter (MDG)

Pair Feeding (DMAA)

Paling Fence

Panchromatic Film (ADA)

Paper and Foil - Capacitor (DEN)

Paracel Islands - Federal Information Processing Standard (FIPS) country code (GEON)

Paracel Islands - NCIC country-territory code (NCIC)

Parachute Facility (NASA)

Parachute Flare (NVT)

Parafascicular Nucleus - Neuroanatomy

Parallel Feed (ELAL)

Parallel Fiber - Neuroanatomy

Parallel Flow

Parallel Fold

Paramount Funding Corp. - Toronto Stock Exchange symbol

Parapsychology Foundation (EA)

Parity Flag (SAUS)

Park Factor (SAUS)

Partial Function (IAA)

Partition Factor (NRCH)

Passage Free (ROG)

Patellofemoral Joint - Anatomy (DAVI)

Path Finder - British military (DMA)

Pathfinder Fund (EA)

Patriotic Front - Zimbabwe - Political party (PPW)

Patrol Vessel, Frigate - Navy symbol

Paved Flume (COE)

Payload Forward - NASA (MCD)

Payload Function - NASA (MCD)

Payload operational instrumentation MDM-FWD (SAUS)

Peace and Freedom Party - Political party (DLA)

Peak Flow - Medicine

Peak Frequency

Peanut Flour

Pedal Furrow

Penalty Fare (UKR)

Penetration Fracture (IAA)

Pen Fanciers (EA)

Pen Friends - Defunct (EA)

Pension Fund

People First International (EA)

Perchloryl Fluoride (SAUS)

Peregrine Fund (EA)

Perfect

Perfect Fluid (SAUS)

Performance Factor

Perfusion Fixation - Histology

Perfusion Fluid - Medicine (DMAA)

Pericardial Fluid - Medicine (DMAA)

Periodic Fever - Medicine (EDAA)

Peritoneal Fluid - Medicine (MAE)

Permanent Fireman

Permanent Force - Canadian Militia before 1940

Permeability Factor

Personal File (CARL)

Personal Finance (SAUS)

Personal Fouls - Basketball

Personality Factor

Personal Security File Number - British Secret Service

Petroferric - Soil biology - Soil phases (QSUL)

Pfennig - Penny - Monetary unit - German

Pforzheim - German license plate city code

Phenol-Formaldehyde - Organic chemistry

Phenylalanine and Methotrexate - Antineoplastic drug regimen (DAVI)

Philatelic Foundation (EA)

Phonetic Form - Linguistics (IEL)

Photofluorography (SAUS)

Photogrammetric Facility - Army

Photon Factory (SAUS)

Physical File (SAUS)

Physicians Forum (EA)

Pianoforte - Soft, then Loud - Music

Pico Farad (ACAE)

Picture Frequency (SAUS)

Picture Frustration - Study (MAE)

Piedmont Fracture (MELL)

Piled Fathom (SAUS)

Pilgrim Fellowship (EA)

Pilot Flying (GAVI)

Pilot Stop Filter (IAA)

Pininfarina - Automotive coachworks

- The Pioneer & Fayette Railroad Co. - AAR code

Pipkin Fracture (MELL)

Pistonfon (SAUS)

Piu Forte - A Little Louder - Music

Plain Face - Construction

Plane Frame - Camutek - Software package (NCC)

Planning Forum (EA)

Plantar Fasciaitis - Medicine

Plantar Flexion - Medicine

Plasma Factor (DMAA)

Plasticity Index - Soil (DICI)

Platelet Factor - Hematology

Platform (SSD)

Plentiful Foods - Department of Agriculture - A publication

Pleural Fluid - Medicine (DB)

Plot Function - Computer science

Plug-Flow Transport (SAUS)

Pneumatic Float

Poco Forte - Rather Loud - Music

Poe Foundation (EA)

Point Foundation (EA)

Point of Foul - Football

Point of Frog - Electronics (MSA)

Points For - Football

Polar Front - Climatology

Polarization Fraction (SAUS)

Polarizing Filter (SAUS)

Pole Figure (SAUS)

Pole Fittings - JETDS nomenclature - Military (CET)

Police Forces - British

Police Foundation (EA)

POLISARIO - Frente Popular para la Liberacion de Saguia El Hamra y Rio De Oro - Popular Front for the Liberation of Saguia El Hamra and Rio De Oro - Morocco (PD)

Poloidal Field (MCD)

Polycenter Framework (SAUS)

Polyurethane Foam

Pool Frequency - Pisciculture

Poop and Forecastle - of a ship (DS)

Poor Foam

Popular Forces - South Vietnam

Pore Free (IAA)

Por Favor - Please - Portuguese

Portal Fibrosis - Medicine

Portfolio - A publication

Position Failure

Position Finder - British military (DMA)

Postage Free (ROG)

Posterior Fontanelle - Anatomy (DAVI)

Postman's Federation - A union - British

Posture Foundation - Initialism is used in brand of sneaker shoe, PF Flyers

Potency Factor (GNE)

Potential Flow (SAUS)

Pott's Fracture - Medicine (MELL)

Powered Flight (NASA)

Power Factor - Radio

Power Focus - Photography

Power Frame - Telecommunications (TEL)

Power Frequency (SAUS)

Prayer of Fortitude

Precursor Fluid - Medicine (MEDA)

Pred Forte (SAUS)

Prefer - Telegraphy (PCTE)

Preference

Preferred

Prefetch - Computer science

Preflight

Preformed Fragment (SAUS)

Presbyterian Foundation - Australia

Pressure Fan (AAG)

Preterm Foundation - Australia

Primary Fibrinolysin - Medicine (DMAA)

Primary File (SAUS)

Primary Filter - Automotive engineering

Prime Function (NASA)

Principles of Flight (SAUS)

Priority Firm Power

Prison Fellowship Ministries (EA)

Private File (SAUS)

Probability Factor (SAUS)

Probability of Failure (NASA)

Probability of Fool (ACAE)

Probability of Fratricide (ACAE)

Procurator Fiscal

Pro Female - International Bowhunting Organization - Class Equipment

Profile (KSC)

Program Function - Computer science (IBMDP)

Programmable Format - Perforating keyboard

Programmable Function (NITA)

Programmed Function (SAUS)

Programming Fault (SAUS)

Progressive Foundation (EA)

Project Friend (EA)

Projectile Fragment

Proof

Prop Forward

Proposed Finding - Nuclear energy (NRCH)

Prostatic Fluid - Medicine (DMAA)

Prostatitis Foundation (SAUS)

Protection Factor

Protein Factor (SAUS)

Protein-Free

Protoflight (ACAE)

Protoplasmic Fracture - Freeze etching in microscopy

Proximity Fuze - Bomb, rocket, or shell

PsychoHistory Forum (EA)

Psynetics Foundation (EA)

Public Funding - Finance (WDAA)

Pulmonary Blood-Flow - Medicine (DB)

Pulmonary Factor - Medicine

Pulmonary Function - Medicine (DMAA)

Pulse Feedback - Telecommunications (IAA)

Pulse Frequency

Pulverized Fuel

Punch Feed (SAUS)

Punch Off - Computer science (BUR)

Purge Fan - Nuclear energy (NRCH)

Purge Flow - Automotive engineering

Purkinje Fibers - Cardiology (DAVI)

Purple Finch - Ornithology

Purpura Fulminans (DB)

Pygmy Fund (EA)

Pyrolysis Fluorescence (SAUS)

Trans Pennsylvania Airlines - ICAO designator (AD)

Paracel Islands - MARC country of publication code - Library of Congress (LCCP)

Perfect (WDAA)

Perofskite - CIPW classification - Geology

Pianoforte (WDAA)

Power Factor (IDOE)

profiled (SAUS)

Pro Forma - As a Matter of Form - Latin (WGA)

Pfeifferella - Genus of bacteria

Pro Forma (EBF)