sigma(redirected from Lunate sigma)
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1. the 18th letter in the Greek alphabet (Σ, σ or, when final, ς), a consonant, transliterated as S
2. Maths the symbol Σ, indicating summation of the numbers or quantities indicated
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
sigma(σ) The 18th letter of the Greek alphabet, used in stellar nomenclature usually to designate the 18th-brightest star in a constellation or sometimes to indicate a star's position in a group.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
A C-shaped spicule.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
1. A covered entrance whose roof is supported by a series of columns or piers, commonly placed at the front entrance to a building.
2. A stoa.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
A scientific visual programming environment from NASA.
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