sigma

Definitions

  • WordNet 3.6
    • n sigma the 18th letter of the Greek alphabet
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Webster's Revised Unabridged Dictionary
    • n Sigma The Greek letter Σ, σ, or ς (English S, or s). It originally had the form of the English C.
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Century Dictionary and Cyclopedia
    • n sigma The name of the Greek letter Σ, σ, ς, equivalent to the English S, s. (For its early forms, see under S.) There is also an uncial form (see uncial), namely C, made from Σ by curving and slighting; this has been revived in some recent alphabets of Greek.
    • n sigma An S-shaped or sigmoid flesh-spicule of a sponge.
    • n sigma The curve of the letter S or any approximate curve.
    • n sigma In descriptive biol., one of the S-shaped ridges on the surface of certain molluscan shells, as those of gastropods and cephalopods.
    • n sigma In experimental psychology, the time-unit, of a second: abbreviated σ.
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Chambers's Twentieth Century Dictionary
    • n Sigma sig′ma the Greek letter corresponding to our s—written Σ (capital), σ (small initial) or ς (small final)
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Etymology

Webster's Revised Unabridged Dictionary
L., from Gr. ,

Usage

In literature:

Neuter nouns end in these two latter vowels; also in {nu} and {sigma}.
"Poetics" by Aristotle
We wouldn't want a Phi Sigma Tau to fail, you know.
"Grace Harlowe's Senior Year at High School" by Jessie Graham Flower
Grace thought "Phi Sigma Tau" would sound well.
"Grace Harlowe's Junior Year at High School" by Jessie Graham Flower
The sigma-ray needler, which he carried, was the only weapon which could be used, under the circumstances.
"Time Crime" by H. Beam Piper
Let {sigma} be the name of any condition which some abstractive sets fulfil.
"The Concept of Nature" by Alfred North Whitehead
All of them wore, in addition to their temple knives, holstered sigma-ray needlers.
"Temple Trouble" by Henry Beam Piper
Thermic induction, atomic disintegration, the Lavender Ray, these were the Alpha, the Sigma, the Omega of his existence.
"The Man Who Rocked the Earth" by Arthur Train
Of the Eight Originals Plus Two, and of their old sorority, the Phi Sigma Tau, she was the only one left in Oakdale.
"Grace Harlowe's Problem" by Jessie Graham Flower
And all of these records were summed up, integrated, into the "Sigma" curve.
"The Vortex Blaster" by Edward Elmer Smith
Did you ever read Ouida's 'Sigma?
"A Black Adonis" by Linn Boyd Porter
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In news:

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The Lean, Six Sigma , and Lean Six Sigma seminars provide practical skills and tools for you to immediately implement what you learn.
Six Sigma focuses on reducing variation.
Sigma -Aldrich is a leading Life Science and High Technology company.
Six Questions About Six Sigma .
3PLs embrace Six Sigma to drive out costs and increase quality.
Motorola scientist/engineer Bill Smith introduced the concept of Six Sigma in 1986.
Used Mitsubishi Sigma by Years.
Integrating Lean Six Sigma and a manufacturing execution system can help meet regulatory compliance goals.
You can't Six Sigma your way to innovation.
Sigma Dealer Rebate Program a Success.
As an acknowledged industry leader in Marine tank coating technology Sigma Coatings has added another groundbreaking product to its assortment which already includes Sigma Phenguard and Sigmaguard CSF.
The impact of Six Sigma .
Salinsky Honored by SIGMA .
Sigma Corporation of America has announced that the Sigma DP2 Merrill compact digital camera will be available in the United States on July 12 for the street price of $999.
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In science:

Also the Nambu-Goto action is equivalent to the following action S = Z dX µ ∧ ηµ ± which is the Poisson sigma model on two dimensional M .
A note on topological brane theories
Singer, “The Topological Sigma Model,” Commun.
A note on topological brane theories
One-sigma errors correspond to an increase of unity in χ2 over its best-fit value.
Disc heating in NGC 2985
The distribution of points, ‘the error cloud’, not only yields the one-sigma errors but it also provides a measure of the covariance between the two parameters.
Disc heating in NGC 2985
All the one-sigma points in Fig. 3 are located below the line σz = σR .
Disc heating in NGC 2985
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