or other things indicated below.
Agencies and organizations
- Pacific Science Association, a regional non-governmental organization that seeks to advance science and technology in support of sustainable development in the Asia-Pacific region
- Pacific Sociological Association, the professional association of sociologists in the Pacific Region of North America
- Parramatta Salvation Army, a Salvation Army Corps in the Western Suburbs of Sydney, Australia
- The Philippine Support Association, a support and awareness group for Oikocredit Philippines
- Philosophy of Science Association, an academic organization which promotes further studies and free discussion from diverse standpoints in the field of philosophy of science
- Photographic Society of America, an association that seeks to promote and enhance the art and science of photography in all its phases, among members and non-members alike.
- Pi Sigma Alpha
- Polish Society of Actuaries, the professional association in Poland
- Political Studies Association, an academic association in the UK
- Poultry Science Association, a poultry science association based in the United States
- Premier Soccer Alliance, the original name of the World Indoor Soccer League
- Private Security Authority, the state regulator for the security industry in the Republic of Ireland
- Professional Speakers Association, in the UK
- Professional Squash Association, the governing body for the men's professional squash circuit
- Philmont Staff Association, the official organization of current and former staff members at Philmont Scout Ranch
- Property Services Agency, a former agency of the UK government concerned with buildings and estate management
- Public Schools Association, an association of seven independent boys schools in Perth, Western Australia
- Public Securities Association, the former name of the Bond Market Association
- New Zealand Public Service Association, a large union for workers in the public sector of New Zealand
- Public Servants Association of South Africa, a trade union in South Africa
- Public Service Association of NSW, the main trade union for New South Wales State Government Employees, Australia
- Public Services Association, a trade union in Trinidad and Tobago
- Pakistan Student Association, An Association of Pakistani Students
Communications and entertainment
Science and medicine
- Pacing System Analyzer, a testing device for Artificial pacemakers
- Patient Safety Authority, a Pennsylvania state agency and Patient safety organization
- Persistent sexual arousal syndrome, a spontaneous and persistent genital arousal
- Pharmaceutical Society of Australia, a professional organisation of Australian pharmacists
- polar surface area, the surface sum over of polar atoms, e.g. oxygen, nitrogen, etc
- Polysialic acid
- Prefixed Save Area, a common area of virtual storage from address zero through 8191 in every address space on a z/OS mainframe system
- Pressure Swing Adsorption, a special method for purifying gases
- Pressure sensitive adhesive, adhesive that is activated by pressure
- Probabilistic safety assessment or Probabilistic risk assessment
- Professional Services Automation, refers to a suite of software enabling service organizations to manage people and skilled resources
- Prostate-specific antigen, a substance in men's blood that helps to identify prostate cancer
- Pushdown Stack Automaton
Transport
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