ST

ST, St, or St. may refer to:

Arts and entertainment

 * Stanza, in poetry
 * Suicidal Tendencies, an American heavy metal/hardcore punk band
 * Star Trek, a science-fiction media franchise
 * Summa Theologica, a compendium of Catholic philosophy and theology by St. Thomas Aquinas
 * St or St., abbreviation of "State", especially in the name of a college or university

Transportation

 * Germania (airline) (IATA airline designator ST)
 * Maharashtra State Road Transport Corporation, abbreviated as State Transport
 * Sound Transit, Central Puget Sound Regional Transit Authority, Washington state, US
 * Springfield Terminal Railway (Vermont) (railroad reporting mark ST)
 * Suffolk County Transit, or Suffolk Transit, the bus system serving Suffolk County, New York

Other businesses and organizations

 * Statstjänstemannaförbundet, or Swedish Union of Civil Servants, a trade union
 * STMicroelectronics, a worldwide manufacturer of semiconductors

Geography

 * São Tomé and Príncipe (ISO 3166-1 country code ST)
 * .st, Internet country code top-level domain for São Tomé and Príncipe
 * Saxony-Anhalt, a state of Germany
 * Split, Croatia (vehicle plate code ST)
 * Stoke-on-Trent postcode area, United Kingdom
 * St or St., abbreviation of Saint
 * St or St., abbreviation of Street
 * St or St., abbreviation of Strait

Language and typography

 * Sesotho language (ISO 639-1 language code "st")
 * ﬅ, or st, a typographic ligature
 * Standard Theory in generative grammar

Computing

 * ST connector, a type of optical fiber connector
 * Atari ST, a personal computer
 * Prefix of hard disk drives made by Seagate Technology, e.g. ST-506
 * Internet Stream Protocol, an experimental Internet protocol
 * Structured text, a high-level programming language that syntactically resembles Pascal and is designed for programmable logic controllers (PLC)
 * .st, the Internet country code top-level domain (ccTLD) for São Tomé and Príncipe
 * St (terminal emulator), minimalist terminal emulator by suckless.org

Mathematics

 * Standard part function, a term used in non-standard analysis

Physics

 * Stanton number St, used in physics
 * Strouhal number St, used in fluid mechanics
 * String theory

Units of measurement

 * Stokes (unit) (St), a CGS unit of kinematic viscosity
 * Stone (weight) (st.), a unit of mass used in the British Isles and other countries

Medicine

 * ST segment, the part of an electrocardiogram connecting the QRS complex and the T wave
 * Sulfotransferase, enzymes that catalyze the transfer of a sulfo group
 * Heat-stable enterotoxin, secretory peptides produced by some bacterial strains, such as enterotoxigenic Escherichia coli

Other uses

 * -st, a suffix for an ordinal number, such as 1$st$ or 21$st$
 * Saint (St or St.), especially in Christianity
 * Scheduled Tribes, in India
 * Ship prefix for a steam tug
 * Sine tempore (s.t.), Latin term indicating that a lecture will begin at the exact time; see Academic quarter (class timing)
 * Striker (association football), a position in association football
 * ST, a type of London bus
 * ST, a court-ordered pseudonym used during a British court case; see Sudiksha Thirumalesh case