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As a word
- Psi (Greek) (Ψ, ψ) a letter of the Greek alphabet
- Psi (Cyrillic) (Ѱ, ѱ), a letter of the early Cyrillic alphabet, adopted from Greek
- Psi (instant messaging client), a popular Jabber client program
- Psi (parapsychology)
- Psi-Theory, a theory about the human mind, a cognitive architecture
- Psi hit, a parapsychological experimentation term
- Psi Factor: Chronicles of the Paranormal, a Canadian television series
As a Greek letter
- J/ψ particle, a subatomic particle
- Wavefunction in Quantum Mechanics, ψ
- In physical chemistry, Ψ represents water potential, the potential energy of a water solution relative to pure water
- Ψ stands for psychology and psychologist, often used in the logo of various psychological associations
- ΨΧ (Psi Chi), National Honor Society in Psychology
In mathematics
- ψ is used to denote the angle between the tangent and the x-axis in the intrinsic coordinates system
- ψ can also denote the digamma function, the polygamma functions, or the Dedekind psi function
As an abbreviation
PSI
PSI can be an abbreviation for:
- Italian Socialist Party (Partito Socialista Italiano)
- Pandemic Severity Index by the US Centers for Disease Control and Prevention
- Paul Scherrer Institute in Villigen, Switzerland
- Pechersk School International in Kyiv, Ukraine
- Permanent Staff Instructor in the British Army
- Permanent Subcommittee on Investigations (PSI) of the US Senate
- Pneumonia severity index
- Pollutant Standards Index, an air pollution index developed by the US Environmental Protection Agency
- Population Services International, an international healthcare NGO based in Washington DC
- Portuguese Stock Index (PSI-20), a benchmark stock market index of companies that trade on Euronext Lisbon, the main stock exchange of Portugal
- Presentence Investigation
- Professional Secretaries International
- Professors for a Strong Israel
- Program Specific Information, part of the MPEG transport stream protocol. For other uses see Psi. Psi (uppercase Ψ, lowercase ψ) is the 23rd letter of the Greek alphabet and has a Psi (Ѱ ѱ is a letter in the Early Cyrillic alphabet, derived from the Greek letter psi (Ψ ψ Psi is a GPL Instant messaging client for the Jabber ( XMPP) protocol which uses the Qt toolkit Psi is a term from Parapsychology derived from the Greek, ψ psi twenty-third letter of the Greek alphabet; from the Greek ψυχή Prof Dietrich Dörner 's Psi-Theory is about human action regulation intention and behaviour Psi hit and psi miss are terms used in discussion of Parapsychological experimentation to describe the success or failure of the subject in achieving the desired result Psi Factor Chronicles of the Paranormal is a Canadian Sci-fi / Drama Television series which was filmed in and around Toronto The J/ψ is a Subatomic particle, a flavor -neutral Meson consisting of a charm Quark and a charm anti -quark A wave function or wavefunction is a mathematical tool used in Quantum mechanics to describe any physical system Water potential is the Potential energy of Water relative to pure water (e Psychology (from Greek grc ψῡχή psȳkhē, "breath life soul" and grc -λογία -logia) is an Academic and Psi Chi (ΨΧ is the National Honor Society in Psychology founded in 1929 for the purposes of encouraging stimulating and maintaining excellence in scholarship and advancing the science In Mathematics, the digamma function is defined as the Logarithmic derivative of the Gamma function: \psi(x =\frac{d}{dx} \ln{\Gamma(x}= In Mathematics, the polygamma function of order m is defined as the ( m + 1th Derivative of the logarithm of the Gamma function In Number theory, the Dedekind psi function is the Multiplicative function on the positive integers defined by \psi(n = n \prod_{p|n}\left(1+\frac{1}{p}\right The Italian Socialist Party ( Partito Socialista Italiano, PSI was a democratic socialist / social democratic political party founded in Genoa The Pandemic Severity Index (PSI is a proposed classification scale for reporting the severity of Influenza pandemics in the United States. The Paul Scherrer Institute (PSI is a multi-disciplinary research institute which belongs to the Swiss ETH-Komplex covering also the ETH Zurich and EPFL Pechersk School International (PSI provides education for children from the ages of two and a half to eighteen years in Kiev, Ukraine. A Permanent Staff Instructor ( PSI) is a Warrant Officer Class 2 (WO2 or senior Non-commissioned officer ( Sergeant, Staff Sergeant The Permanent Subcommittee on Investigations ( PSI) is the oldest subcommittee of the U The Pneumonia severity index ' or PORT Score' is a clinical prediction rule that medical practitioners can use to calculate the probability of Morbidity The Pollutant Standards Index, or PSI, provides a uniform system of measuring pollution levels for the major air pollutants Population Services International (PSI PSI is a nonprofit organization based in Washington D The PSI-20 (an Acronym of Portuguese Stock Index) is a benchmark Stock market index of companies that trade on Euronext Lisbon, the main A presentence investigation report ( PSI) is a Legal term referring to the investigation into the history of person convicted of a crime before sentencing to determine The International Association of Administrative Professionals (IAAP was formed in Kansas City, Missouri in 1942. Professors for a Strong Israel is a right-wing organization of academics united by a shared concern for the security and the Jewish character of the State of Program Specific Information (PSI is Metadata, part of MPEG transport stream. Metadata for digital transmission
- Proliferation Security Initiative
- Protein Structure Initiative, a structural genomics initiative of the U. The Proliferation Security Initiative (PSI is an international effort led by the United States to interdict transfer of banned weapons and weapons technology The Protein Structure Initiative (PSI is a federal university and industry effort aimed at dramatically reducing the costs and lessening the time it takes to determine a three-dimensional protein S. NIGMS
- Public Services International, a global union federation of public sector trade unions
- PSI (computational chemistry) software
- PSI (prion), an infectious protein in yeast
- PSI Records, a record label
- Statisticians In The Pharmaceutical Industry, the PSI acronym (rather than SPI) is chosen for its relation to the Greek letter Ψ, commonly used in statistical formulae
psi
- Pounds per square inch, a unit of pressure
pSi
In comics
- Psi (comics), a character in DC Comics
- Psi-Force, a comic series
- Psi-Hawk, a comic character
- Psi Lords, a comic series
- Psi Division, a division in the Judge Dredd and 2000 AD series of comics
In music
In video games
- In the EarthBound series, the main characters use psychic abilities known as PSI pronounced PK. Template talkInfobox Union for usage --> Public Services International (PSI is a Global union federation of PSI is an ab initio Computational chemistry package originally written by the research group of Henry F Fungal Prions have been investigated leading to a deeper understanding of disease-forming Mammalian prions PSI Records is an independent British / American Record label started by JS Clayden and his brother/musical partner Mark Clayden Statisticians in the Pharmaceutical Industry, abbreviated to PSI, is an organisation for the promotion of statistical thinking in order to improve the quality of research The pound per square inch or more accurately pound-force per square inch (symbol psi or lbf/in² or lbf/in²) is a unit of Porous Silicon (pSi is a form of the chemical element Silicon which has an introduced nanoporous holes in its microstructure rendering a large surface to volume ratio in the Psi is a DC character created by Paul Kupperberg and Carmine Infantino for Daring New Adventures of Supergirl #1 (November 1982 Psi-Force was a thirty-two-issue Comic book series published by Marvel Comics under their New Universe imprint from 1986 Psi-Hawk is a fictional creation from the Marvel New Universe line The PSI-Lords are a fictional team of superbeings from the Valiant Comics universe. Psi Division (Psionics Division is a fictional organisation in the Judge Dredd and Anderson Psi Division comic strips in 2000 AD Psi Power is a 1978 song by the UK rock group Hawkwind. It was originally released as a single in the UK (CB323 on 6 October 1978 being a slightly different Psi Com was an American Gothic rock / New Wave band of the mid-1980s EarthBound, known in Japan as, is a role-playing Video game designed by Shigesato Itoi for the Super Nintendo Entertainment Examples of these powers are PSI(PK) Fire and PSI(PK)Freeze.
Dictionary
psi
-noun
- (countable) The twenty-third letter of Classical and Modern Greek and the twenty-fourth letter of Old and Ancient Greek.
- (uncountable, parapsychology) A form of psychic energy.
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