ST

ST may refer to:

Arts and entertainment

• Stanza, in poetry
• School Tycoon, a video game
• Self-titled, a term used in the record industry for eponymous albums
• The Sims 3: Showtime, the sixth expansion pack for The Sims 3
• The Legend of Zelda: Spirit Tracks, a video game
• Storm Track, an early magazine about storm chasing
• Star Trek, a television and film franchise
• Suicidal Tendencies, an American heavy metal/hardcore punk band
• ST (rapper) (born 1988), Russian rapper

Businesses and organizations

Transportation

• Germania (airline) (IATA airline designator ST)
• Maharashtra State Road Transport Corporation, abbreviated as State Transport
• Sound Transit, the popular name of Washington state's Central Puget Sound Regional Transit Authority
• Springfield Terminal Railway (Vermont) (railroad reporting mark ST)
• Student Transportation, Inc., a school bus contractor
• 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
• Secret Team, an alleged covert alliance between the CIA and American industry
• STMicroelectronics, a worldwide manufacturer of semiconductors
• SpeedTouch, a networking equipment company

Geography

• São Tomé and Príncipe (ISO 3166-1 country code ST)
  • .st, Internet country code top-level domain for São Tomé and Príncipe
• Split, Croatia (vehicle plate code ST)
• Street (St or St.), a public thoroughfare
• Strait (St or St.), a body of water

Language and typography

• Sesotho language (ISO 639-1 language code "st")
• ſt, or st, a typographic ligature
• Stet, a printer's proofing mark on manuscripts
• Standard Theory, in generative grammar

Science and technology

Computing

• ST connector, a type of optical fiber connector
• Atari ST, a personal computer
• Seagate Technology, a manufacturer of hard disk drives
• Number of sectors, in the cylinder-head-sector (CHS) hard disk drive access method
• State Threads, a user-space threading C-library, especially for network-applications
• Internet Stream Protocol, an experimental Internet protocol
• Structured text, a high-level programming language that syntactically resembles Pascal
• Sublime Text, a cross-platform text and source code editor

Mathematics

• Standard part function, a term used in non-standard analysis
• "Subject to" or "such that" (s.t.) to indicate constraints

Physics

• String theory, a branch of theoretical physics
• Stanton number, a term used in physics
• Strouhal number, a term used in fluid mechanics

Units of measurement

• Short ton, a unit of mass equal to 2000 lb, or one ton in the United States
• Stere, a unit of volume equivalent to one cubic meter, used to measure cordwood
• Stokes (unit) (St), a CGS unit of kinematic viscosity
• Stone (weight) (st.), a unit of mass used in the British Isles and other countries

Other uses in science and technology

• ST segment, the part of an electrocardiogram connecting the QRS complex and the T wave
• Speech therapy, a treatment in Speech-Language Pathology
• Spread Tow, a technology for spreading a tow to make ultra light fabric for the composites industry
• Tropopause, the stratosphere-troposphere boundary, in the Earth's atmosphere

Other uses

• -st, a suffix for an ordinal number, such as 1^st or 21^st
• Saint (St or St.), especially in Christianity
• Septic tank, in real estate documents
• Steam tug, a ship class prefix
• Sine tempore (s.t.), indicating that an academic lecture will begin at the exact time; see Academic quarter (class timing)
• Common stock (US) or ordinary shares (British) (symbol St or StA) on the German Stock Exchange