S (disambiguation)

S is the nineteenth letter of the English alphabet.

S may also refer to:

<s>, the deprecated HTML element "start tag" for strike-through text, ~~like this~~
Shilling (British coin)
S band, a band of radio which ranges from 2 to 4 GHz
S-block of the periodic table, which includes alkali metals, alkaline earth metals, and hydrogen and helium
S combinator in combinatory logic
S (band), the name that Jenn Ghetto, formerly of Carissa's Wierd, now performs under.
S (group), a short-lived South Korean music group, active in 2003
S postcode area, a postcode area including Sheffield, England
S (programming language), a statistical programming language
Long s, a mathematical term for the integral sign
"S", the nickname for Solomon Shereshevskii (1886-1958), Russian journalist known for an exceptional memory
South on a map, one of the 4 cardinal directions
s, son
A party label for the Swedish Social Democratic Party

Science

S, the chemical symbol for the element Sulfur on the periodic table
S, the symbol for entropy
s, the SI symbol for second
s, one of the Mandelstam variables, the square of the invariant mass
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
Serine, a standard amino acid abbreviation
ATC code S Sensory organs, a section of the Anatomical Therapeutic Chemical Classification System
Siemens (unit), the SI derived unit of electric conductance
S phase or synthesis phase, a period in the cell cycle during interphase