Pennsylvania, a state of the United States of America
Papua, a province of Indonesia
Pará, a state of Brazil
Palestinian Authority
Proto-Algic (sometimes abbreviated PAc to distinguish it from Proto-Algonquian)
Proto-Athapaskan
Proto-Algonquian (sometimes abbreviated PAn to distinguish it from Proto-Algic, but usually just abbreviated PA with Proto-Algic being abbreviated PAc)
Power amplifier.
Public accountant.
Public Act.
The ground squirrel.
The gopher rockfish.
A small burrowing rodent native to North and Central America, especially in the family Geomyidae (true gophers).
The gopher tortoise.