Psi

Psi is for:

  • Psi (letter) (Ψ, ψ), the 23rd letter of the Greek alphabet.
  • Psi (Instant Messenger), instant messenger software
  • Psi-Corps, fictional organization; grouping in the U.S. science fiction television series Babylon 5, see races and groups in the Babylon 5 universe #Psi-Corps
  • Psi Islands, group of islands in the Palmer Archipelago, Antarctica
  • Psi-phenomenon, a term from parapsychology


psi stands for:

  • Southeastern Pashai (ISO-639-3 code), dialect of the Afghan Pashai language.
  • Pound-force per square inch, Anglo-American unit of measurement, especially for (tyre) pressure.


pSi stands for:

  • Porous silicon, a form of the chemical element silicon


PSi stands for:

  • indexed horsepower, see horsepower #PSi


PSI stands for:

  • Pan-Sahel Initiative, US military aid agreement with Chad, Niger, Mali and Mauritania
  • Papiri della Società Italiana, Italian collection of ancient papyri, see Istituto Papirologico "Girolamo Vitelli".
  • Parasocial interaction, special (deviant, substitute) social behaviour
  • Periodontal screening index, measure used in periodontology to determine the severity of gingivitis or periodontitis
  • Partai Sosialis Indonesia, Socialist Party of Indonesia, former party in Indonesia
  • Partito Socialista Italiano, Italian Socialist Party
  • Paul Scherrer Institute, Swiss Research Institute for Natural and Engineering Sciences
  • Pestalozzischule Idstein, grammar school, among other things located in the Renaissance castle
  • Equestrian Sport International, Equestrian Sport Magazine
  • Polysuccinimide, starting material for functional polymers from renewable raw materials
  • Poly(organo)siloxane, high-temperature polymer, for example for flexible circuit carriers, see silicones
  • Pollutant Standards Index, a measure of air pollution.
  • Population Services International, international NGO dealing with health issues
  • Portuguese Stock Index 20 (PSI 20), Portuguese stock index
  • Potentially Shippable Increment, Increment in Scrum
  • Potentially system-threatening institution, see systemic relevance
  • Pre-shipment inspection, inspection before shipment, the inspection before shipment in foreign trade.
  • Printempa Semajno Internacia, Esperantist Meeting
  • Proliferation Security Initiative, US initiative to protect against the proliferation of weapons of mass destruction
  • PSI AG (also PSI Aktiengesellschaft für Produkte und Systeme der Informationstechnologie), listed German software company based in Berlin
  • PSI trade fair (Promotional Product Service Institute), trade fair for the promotional products industry in Düsseldorf
  • Public sector information, EU Directive, see Directive 2003/98/EC (PSI Directive)
  • Public Services International, worldwide umbrella organisation for public service unions
  • Stahlnetz: PSI, German television film by Markus Imboden (2002)

Data Processing:

  • Personal Software Inspector, software to check installed applications for known security vulnerabilities and updates
  • Program Specific Information, additional information in an MPEG2 data stream
  • Project Server Interface, interface to MS-Project servers
  • Protocol for Stage Illumination, network protocol for lighting technology etc.


See also:


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