S (disambiguation)

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S is the nineteenth letter of the English alphabet.

S may also refer to:


Language and linguistics[edit]

  • Long s (ſ), a form of the lower-case letter s formerly used where "s" occurred in the middle or at the beginning of a word
  • -s, a suffix added to some English surnames, originally meaning "son of"
  • s, the IPA symbol for a voiceless alveolar sibilant sound
  • S, the subject of an intransitive verb

Mathematics and logic[edit]

Physics and chemistry[edit]

  • S, the chemical symbol for the element Sulfur on the periodic table
  • S, the symbol for entropy
  • S, a non-SI unit used to designate molecule size named after the Svedberg sedimentation coefficient
  • S, a label that denotes one of two chiral center configurations in the R/S system
  • s, one of the Mandelstam variables, the square of the invariant mass
  • Siemens (unit), the SI derived unit of electric conductance
  • S-block of the periodic table, which includes alkali metals, alkaline earth metals, and hydrogen and helium
  • Spin (physics)

Biology and medicine[edit]

  • Serine, a standard amino acid abbreviation
  • ATC code S Sensory organs, a section of the Anatomical Therapeutic Chemical Classification System
  • S phase or synthesis phase, a period in the cell cycle during interphase


  • Samsung Galaxy S, the first flagship smartphone of the Samsung Galaxy S series
  • S (programming language), an environment for statistical computing and graphics
  • <s>, the opening tag for the HTML element denoting information that is "no longer accurate or no longer relevant", usually rendered as strike-through text




  • S, the stage name of singer-songwriter and guitarist Jenn Champion
  • S (group), a short-lived South Korean music group active in 2003 and 2014
  • S (EP), a 2001 EP by Japanese musical duo NaNa
  • Numbering of Franz Liszt's works according to Humphrey Searle's catalogue


Other uses[edit]

  • Sierra, the military time zone code for UTC−06:00

See also[edit]