What does Pah stand for?

Piper Pressurised Prop-Jet - Airplane code

Pacific & Asian History - Australian National University (APS)

Paducah - Kentucky - Airport symbol (OAG)

Pahoa - Hawaii - Seismograph station code, US Geological Survey - Closed (SEIS)

Pan American Highway (SAUS)

Panorama Air Tour, Inc. - ICAO designator (FAAC)

Para-Aminohippurate - Clearance Test - Urology (DAVI)

Para-Aminohippuric - Biochemistry

Para-Aminohippuric Acid (SAUS)

Para-Amino-Hyppurate (SAUS)

Parker-Hale - NCIC firearms make code (NCIC)

Parts Application Handbook

Pathtechnics Ltd. - Vancouver Stock Exchange symbol

Patriot American Hospitality, Inc. - NYSE symbol (SAG)

Payload Accommodations Handbook - NASA (NASA)

Phase Adjusting Hub

Phenylalanine Hydroxylase - An enzyme

Pincock, Allen and Holt - Commercial firm

Pitch Attitude Hold - Aviation (MCD)

Polyaromatic Hydrocarbon (EDCT)

PolyAromatic Hydrocarbons - A chemical compound

Polycyclic - or Polynuclear Aromatic Hydrocarbon - Organic chemistry

Polycyclic Aromatic Hydrocarbons - Automotive emissions - Organic chemistry

Polynuclear Aromatic Hydrocarbon (EEVL)

Polynuclear Aromatic Hydrocarbons - A hydrocarbon compounds with multiple benzene rings

Pulmonary Artery Hypertension - Medicine

Pulmonary Artery Hypotension - Cardiology (DAVI)

Push and Hold - Push button

Tenharim - Language code (ETLW)