could be written with different numbers of angles and strokes. Besides the classical form with four strokes (), a three-stroke form resembling an angular Latin S () was commonly found, and was particularly characteristic of some mainland Greek varieties including Attic and several "red" alphabets. Σ: classical Greek letter Sigma Ϲ ϲ: Greek lunate sigma : Coptic letter sima С с : Cyrillic letter Es, derived from a form of sigma 𐌔 : Old Italic letter S, includes the variants also found in the archaic Greek letter S: Latin letter S : Runic letter sowilo, which is derived from Old Italic S : Gothic letter sigil Ս : Armenian letter Se Computing codes 1 Other representations Chemistry The letter S is used: In a chemical formula to represent sulfur. For example, is sulfur dioxide. In the preferred IUPAC name for a chemical, to indicate a specific enantiomer. For example, "(S)-2-(4-Chloro-2-methylphenoxy)propanoic acid" is one of the enantiomers of mecoprop. See also Cool S See about Ⓢ in Enclosed Alphanumerics Notes References External links ISO basic Latin letters