PACS

PACS is an acronym with several meanings:

Medicine

 * Post-Acute COVID-19 Syndrome
 * Partial Anterior Circulation Stroke Syndrome, the symptoms of a type of an ischemic stroke
 * Picture Archiving and Communication System, a system used in medical imaging to store, retrieve, distribute, analyze, and digitally process medical images.

Organizations and establishments

 * Pacte civil de solidarité, a form of civil union in France
 * Palo Alto Chinese School, Palo Alto, California, USA
 * Poorest Areas Civil Society Program (2001–2008), a defunct Indian social welfare program
 * Primary Agricultural Credit Society, co-operative credit institutions in India
 * Provisional Army of the Confederate States, the "volunteer" or wartime-expansion component of the Confederate States Army

Child psychology

 * Phonological Assessment of Child's Speech, a type of analysis battery used in developmental psychology to ascertain if a child has a reading disorder.
 * Phonological Awareness Composite Scores, a marking criterion as part of the CTOPP assessment battery for assessing a child's awareness of the oral structure of language.

Physics and astronomy

 * Physics and Astronomy Classification Scheme, a scheme developed by the American Institute of Physics
 * Photodetecting Array Camera and Spectrometer, an instrument of the Herschel Space Observatory

PACs
PACs is the plural of PAC; for example:
 * Political action committees, groups organized to elect or defeat political candidates
 * Premature atrial contractions

Other

 * Primary airport control station, a survey marker established in the vicinity of an airport
 * Personal access control system. Gates, barriers and turnstiles that provide security for restricted areas on buildings and sites.
 * Cape Sarichef Airport (ICAO airport code), on Unimak Island of the Aleutian Islands, Alaska
 * Peace and conflict studies, an academic field that identifies and analyzes violent and nonviolent behaviors of social conflicts