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S,

19th letter of the alphabetalphabet
[Gr. alpha-beta, like Eng. ABC], system of writing, theoretically having a one-for-one relation between character (or letter) and phoneme (see phonetics). Few alphabets have achieved the ideal exactness.
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, representing the common sibilant, voiceless in spur, voiced in rose. Its Greek equivalent is sigma. In former times the nonterminal s was written or printed much like an f without the right half of the cross bar. In chemistry S is the symbol of the element sulfursulfur
or sulphur
, nonmetallic chemical element; symbol S; at. no. 16; interval in which at. wt. ranges 32.059–32.076; m.p. 112.8°C; (rhombic), 119.0°C; (monoclinic), about 120°C; (amorphous); b.p. 444.674°C;; sp. gr. at 20°C;, 2.07 (rhombic), 1.
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s

(mathematics)
(particle physics)

S

(electromagnetism)
(electricity)
(fluid mechanics)
(chemistry)

S

1. On drawings, abbr. for “side.”
2. On drawings, abbr. for “south.”
3. Abbr. for “seamless.”

second

A unit of secondary quality or one not meeting specified dimensions; a cull.

S

(language)
A statistical analysis language from AT&T.

["S: An Interactive Environment for Data Analysis and Graphics", Richard A. Becker, Wadsworth 1984].