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PSA, PsA, Psa, or psa may refer to:


Biology and medicine

*
Posterior spinal artery The posterior spinal artery (dorsal spinal arteries) arises from the vertebral artery in 25% of humans or the posterior inferior cerebellar artery in 75% of humans, adjacent to the medulla oblongata. It supplies the grey and white posterior column ...
* Primary systemic amyloidosis, a disease caused by the accumulation of abnormal proteins *
Prostate-specific antigen Prostate-specific antigen (PSA), also known as gamma-seminoprotein or kallikrein-3 (KLK3), P-30 antigen, is a glycoprotein enzyme encoded in humans by the ''KLK3'' gene. PSA is a member of the kallikrein-related peptidase family and is secreted b ...
, an enzyme used as a blood tracer for prostate cancer *
Psoriatic arthritis Psoriatic arthritis is a long-term inflammatory arthritis that occurs in people affected by the autoimmune disease psoriasis. The classic feature of psoriatic arthritis is swelling of entire fingers and toes with a sausage-like appearance. Th ...
(PsA), an inflammatory disease * ''
Pseudomonas aeruginosa ''Pseudomonas aeruginosa'' is a common encapsulated, gram-negative, aerobic–facultatively anaerobic, rod-shaped bacterium that can cause disease in plants and animals, including humans. A species of considerable medical importance, ''P. aerug ...
'', a species of bacterium * ''Pseudomonas syringae'' pv. ''actinidiae'', a pathovar of a bacterium that attacks kiwifruit


Chemistry

*
Polar surface area The polar surface area (PSA) or topological polar surface area (TPSA) of a molecule is defined as the surface sum over all polar atoms or molecules, primarily oxygen and nitrogen, also including their attached hydrogen atoms. PSA is a commonly us ...
, the surface sum over all polar atoms of a molecule *
Pressure swing adsorption Pressure swing adsorption (PSA) is a technique used to separate some gas species from a mixture of gases (typically air) under pressure according to the species' molecular characteristics and affinity for an adsorbent material. It operates at ne ...
, a technology for separating, or purifying, gases


Computing

*
Professional services automation Professional services automation (PSA) is software designed to assist professionals, such as lawyers, auditors, and IT consultants, with project management and resource management for client projects and utilization rate management for billable sta ...
, software for automating project and billing management for professional service firms * PSA Certified, Platform Security Architecture, a security certification for the Internet of Things *
Plesk Plesk is a commercial web hosting and server data center automation software developed for Linux and Windows-based retail hosting service providers. It was developed by Plesk International GmbH, with headquarters in Toronto, Canada and Sch ...
Server Administrator, a commercial web hosting automation program


Contracts, legislation, and government

*
Passenger Vessel Services Act of 1886 The Passenger Vessel Services Act of 1886 (sometimes abbreviated to PVSA, Passenger Services Act, or PSA) is a protectionist piece of United States legislation which came into force in 1886 relating to cabotage. Essentially, it says: As a res ...
or Passenger Services Act, US *
Primary statistical area The United States federal government defines and delineates the nation's metropolitan areas for statistical purposes, using a set of standard statistical area definitions. the U.S. Office of Management and Budget (OMB) defined and delineated 39 ...
, a collective term for metropolitan, micropolitan, and combined statistical areas * Problem-solution approach, an approach for assessing inventive step at the European Patent Office *
Production sharing agreement Production sharing agreements (PSAs) or production sharing contracts (PSCs) are a common type of contract signed between a government and a resource extraction company (or group of companies) concerning how much of the resource (usually oil) extra ...
, a contract between a government and a resource extraction company * Public Safety Act, a law in Jammu and Kashmir *
Public service agreement Public service agreements (PSAs) detailed the aims and objectives of UK government departments for a three-year period. PSAs were abolished in June 2010 by the Coalition Government. Such agreements also "describe how targets will be achieved and ...
, UK government department targets for 3-year period *
Public service announcement A public service announcement (PSA) is a message in the public interest disseminated by the media without charge to raise public awareness and change behavior. In the UK, they are generally called a public information film (PIF); in Hong Kong, ...
* Purchase and sale agreement, an agreement between a buyer and a seller


Organizations


World-wide scope

*
Pacific Science Association The Pacific Science Association (PSA) is a regional, non-governmental, scholarly organization that seeks to advance science and technology in support of sustainable development in the Pacific Rim. It was founded in 1920 and its secretariat is bas ...
*
Pacific Sociological Association The Pacific Sociological Association (PSA) is a professional association of sociologists in the Pacific region of North America. The PSA is best known for its annual conference and academic journal'' Sociological Perspectives''. History The Paci ...
*
Philosophy of Science Association The Philosophy of Science Association (PSA) is an international academic organization founded in 1933 that promotes research, teaching, and free discussion of issues in the philosophy of science from diverse standpoints. The PSA engages in activit ...
*
Pro Snowboarders Association The Pro Snowboarders Association (PSA) is organized to promote and protect the rights and personalities of professional snowboarders. The Association was created in March 1990 in Lenzerheide, Switzerland. At that time, event sponsors and the Na ...
*
Professional Skaters Association The Professional Skaters Association International is the largest figure skating coaches association in the world. The PSA was founded on August 10, 1938, in Lake Placid, New York, as the American Skaters Guild, just two years (1936) after the Ice ...
*
Professional Squash Association The Professional Squash Association (PSA) is the governing body for the men's and women's professional squash circuit. The body operates in a similar fashion to the ATP and the WTA for tennis. The PSA's highest professional level, the PSA W ...


Specific to large English-speaking countries

* Australia: **
Pharmaceutical Society of Australia The Pharmaceutical Society of Australia (PSA) is a professional organisation of Australian pharmacists. PSA is the peak national body for pharmacists, representing all of the pharmacy profession in Australia, with approximately 18,000 members ...
**
Public Schools Association Established in 1905 the Public Schools Association, or the PSA, is an association of seven independent boys schools in Perth, Western Australia. The descriptor 'public school' references the historical usage of the term and the model of the Brit ...
, Perth **
Public Service Association of NSW The Public Service Association of NSW (PSA) is a union which covers employees in the government, university and related public sector in New South Wales. The union is registered under New South Wales state legislation and is affiliated with the ...
, a trade union **
The Salvation Army, Parramatta The Salvation Army, Parramatta (often abbreviated to ''PSA'') is a Salvation Army Corps located in the suburb of Parramatta, New South Wales, Australia. It is the 75th oldest active Salvation Army Corps in Australia. Situated in the western sub ...
* United Kingdom: **
Phone-paid Services Authority The Phone-paid Services Authority (PSA), known as PhonepayPlus until 1 November 2016, is the regulatory body for all premium rate phone-paid services in the United Kingdom. These are the content, goods and services that consumers can buy by ch ...
**
Political Studies Association The Political Studies Association (PSA) is a learned society in the United Kingdom which exists to develop and promote the study of politics. It is the leading association in its field in the United Kingdom, with an international membership includi ...
, for academics **
Professional Standards Authority for Health and Social Care The Professional Standards Authority for Health and Social Care (PSA) oversees the nine statutory bodies that regulate health professionals in the United Kingdom and social care in England. Where occupations are not subject to statutory regulation ...
**
Property Services Agency The Property Services Agency (PSA) was an agency of the United Kingdom government, in existence from 1972 to 1993. Its role was to “provide, manage, maintain, and furnish the property used by the government, including defence establishments, offi ...
, former government agency * United States: **
Partnership for a Secure America Partnership for a Secure America (PSA) is a nonprofit organization in Washington, D.C. that seeks to promote bipartisan solutions to today's critical national security and foreign policy issues. Created by former Congressman Lee H. Hamilton and f ...
** Photographic Society of America **
Pi Sigma Alpha Pi Sigma Alpha ( or PSA), the National Political Science Honor Society, is the only honor society for college and university students of political and social sciences in the United States. Its purpose is to recognize and promote high academic ...
, college honor society for political science **
Poultry Science Association The Poultry Science Association (PSA) is an American non-profit professional organization for the advancement of poultry science. Founded in 1908, the PSA is headquartered in Champaign, Illinois. Consisting of 1800 members, PSA is involved in re ...


Other country-specific organizations

*
Parti Solidaire Africain The Parti Solidaire Africain () or PSA was a political party active in the Belgian Congo and subsequently in the Republic of the Congo after the country received its independence. The PSA was formed in the aftermath of a series of riots in L ...
(Democratic Republic of the Congo), defunct political party * New Zealand Public Service Association, trade union *
PSA BPOL The special unit Polizeiliche Schutzaufgaben Ausland der Bundespolizei (PSA BPOL) ("Police Protection Tasks Abroad of the Federal Police", formerly known as ''ASSIK'' for ''Arbeitsstab Schutzaufgaben in Krisengebieten'') is a specialized unit of t ...
a specialised police unit within the Federal Police of Germany *
Petroleum Safety Authority Norway The Petroleum Safety Authority Norway ( no, Petroleumstilsynet, PSA) is a Norwegian governmental supervisory authority under the Norwegian Ministry of Labour and Social Inclusion. The PSA has regulatory responsibility for safety, emergency prepar ...
, governmental supervisory authority *
Palestinian Scout Association The Palestinian Scout Association ( ar, جمعية الكشافة والمرشدات الفلسطينية) is the organization responsible for the Scout movement in Palestine. The Palestinian Scout Association serves youth throughout the St ...
*
Philippine Statistics Authority The Philippine Statistics Authority (Filipino: ''Pangasiwaan ng Estadistika ng Pilipinas''), abbreviated as PSA, is the central statistical authority of the Philippine government that ''collects, compiles, analyzes and publishes statistical inf ...
*
Philippine Support Association The Philippine Support Association (PSA{{Citation needed, date=July 2011) is a group that aims to raise credit for the poor in the Philippines so that they can break free of the poverty trap. It supports microfinance. History The Philippine Su ...
, raising credit for the poor *
Polish Society of Actuaries The Polish Society of Actuaries (PSA, pl, Polskie Stowarzyszenie Aktuariuszy) is the association of actuaries in Poland. The society was established in 1991 to resume activities of the Polish Institute of Actuaries founded in 1920. It is a full mem ...
* PSA International (Singapore), formerly Port of Singapore Authority *
Public Servants Association of South Africa The Public Servants Association of South Africa (PSA) is a trade union for public sector workers in South Africa. The PSA the largest politically non-affiliated trade union for public servants in the country. It was founded in 1920 and has a ...
, trade union *''Partido Socialista de Andalucía'' (Spain), former name of the
Andalusian Party The Andalusian Party ( es, Partido Andalucista, PA) was an Andalusian nationalist centre-left political party from Andalusia (Spain), with an important presence in provinces such as Cádiz and Seville although in the past they have stood in ot ...
*
Socialist Party of Aragon Socialist Party of Aragon (in Spanish: ''Partido Socialista de Aragón'') was a democratic socialist political party in Aragón, Spain. History PSA was formed in 1976 by the Socialist Alliance of Aragón, members of the magazine and cultural group ...
(''Partido Socialista de Aragón''), a now defunct Spanish political party * Authentic Socialist Party (Argentina), ''Partido Socialista Auténtico'' * Public Services Association (Trinidad and Tobago), a trade union *''Partido Socialista Argentino'', the Argentine Socialist Party, a now merged Argentinian political party


Transport

*
PSA Airlines PSA Airlines is an American regional airline headquartered at Dayton International Airport in Dayton, Ohio, United States. The airline is a wholly owned subsidiary of the American Airlines Group and it is paid by fellow group member American Ai ...
, a subsidiary of American Airlines Group *
Pisa International Airport Pisa International Airport ( it, Aeroporto Internazionale di Pisa) , also named Galileo Galilei Airport is an airport located in Pisa, Italy. It is the main airport in Tuscany and the 10th in Italy in terms of passengers. It is named after Galil ...
, Pisa, Italy, IATA code PSA *
Pacific Southwest Airlines Pacific Southwest Airlines (PSA) was a regional U.S. airline headquartered in San Diego, California, that operated from 1949 to 1998. It was the first large discount airline in the United States. PSA called itself "The World's Friendliest Airl ...
, US, 1949 to 1988, ICAO code PSA *
Penn Station Access Penn Station Access is a public works project underway by the Metropolitan Transportation Authority in New York City. The goal of the project is to allow Metro-North Railroad commuter trains to access Penn Station on Manhattan's West Side, usi ...
, a planned New York City rail upgrade *
Groupe PSA The PSA Group (), legally known as Peugeot S.A. (Peugeot Société Anonyme, trading as Groupe PSA; formerly known as PSA Peugeot Citroën from 1991 to 2016) was a French multinational automotive manufacturing company which produced automobiles ...
, ''Peugeot Société Anonyme'', a French multinational automobile manufacturer


Other uses

*
Penal substitution Penal substitution (sometimes, esp. in older writings, called forensic theory)D. Smith, The atonement in the light of history and the modern spirit' (London: Hodder and Stoughton), p. 96-7: 'THE FORENSIC THEORY...each successive period of history ...
, a theory of atonement in Christianity *
Professional Sports Authenticator Professional Sports Authenticator (PSA), is a US based sports card and trading card grading company. History PSA was launched in July 1991 by David Hall, owner of the coin grading company Professional Coin Grading Service (PCGS), to serve ...
(PSA), part of
Collectors Universe Collectors Universe Inc. is an American company formed in 1986, now based in Santa Ana, California, which provides third-party authentication and grading services to collectors, retail buyers and sellers of collectibles. Its authentication servic ...
, an authenticator of sports and trading cards * Autonomous Socialist Party (disambiguation) *
Pisa language Pisa, also known as West Awyu and Asue Awyu, is an Awyu language of South Papua, Indonesia Indonesia, officially the Republic of Indonesia, is a country in Southeast Asia and Oceania between the Indian and Pacific oceans. It consists of ...
or Asue Awyu, ISO 639-3 code psa *
Piscis Austrinus Piscis Austrinus is a constellation in the southern celestial hemisphere. The name is Latin for "the southern fish", in contrast with the larger constellation Pisces, which represents a pair of fish. Before the 20th century, it was also known a ...
(Southern Fish) constellation, IAU abbreviation PsA *
Public Storage Public Storage is an American international self storage company headquartered in Glendale, California, that is run as a real estate investment trust (REIT). It is the largest brand of self-storage services in the US. In 2008, it was the large ...
stock ticker *
Power Station of Art The Power Station of Art is a contemporary art museum in Shanghai. Housed in a former power station, it is China's first state-run contemporary art museum. Converting the building cost $64 million which was paid for by the Shanghai government. ...
, a contemporary art museum in Shanghai, China *
Pressure-sensitive adhesive Pressure-sensitive adhesive (PSA, self-adhesive, self-stick adhesive) is a type of nonreactive adhesive which forms a bond when pressure is applied to bond the adhesive with a surface. No solvent, water, or heat is needed to activate the adhesiv ...
* "PSA", title of an earlier version of the R.E.M. song " Bad Day" {{Disambiguation