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


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
Bopp, Cale and Harry Allen, J. Evans, Alpha Sigma, Liberty, Brooklyn Boy, Jno.
"Golden Days for Boys and Girls" by Various
Between eta and delta is a fifth-magnitude double star, Sigma 725, which is worth a moment's attention.
"Pleasures of the telescope" by Garrett Serviss
Sigma on Moravian hymns, 249.
"Notes and Queries, Index of Volume 5, January-June, 1852" by Various
The little pair southeast of Aldebaran, called the Sigmas, is also a beautiful object.
"Astronomy with an Opera-glass" by Garrett Putman Serviss
The one used in this case was r = 1.00-(6 Sigma d^{2})/(n(n^{2}-1)).
"Vocational Psychology: Its Problems and Methods" by Harry L. Hollingworth
Field work was financed in part by funds provided by the Sigma Xi-RESA Research Fund.
"North American Recent Soft-shelled Turtles (Family Trionychidae)" by Robert G. Webb
Reports from the MA-8 (Sigma 7) and Vostok III and IV flights seem to support this assumption.
"Significant Achievements in Space Bioscience 1958-1964" by National Aeronautics and Space Administration
London, printed in the year 1754: this is the larger hymn-book alluded to by SIGMA.
"Notes and Queries, Vol. V, Number 134, May 22, 1852" by Various

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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
The sigma model metric must satisfy certain equations of motion to provide a conformally invariant theory.
The D0-brane metric in N = 2 sigma models
This metric can be called the“physical” sigma model metric.
The D0-brane metric in N = 2 sigma models
For this case, Lk is the Hirzebruch equivariant factor, G is the sigma gauge field and Ck is the product of the components of the vector s.
Wess Zumino Couplings for Generalized Sigma Orbifold Fixed-points
When the SO(2n) bundle over the space-time is the tangent bundle of the space-time, one obtains the usual formula for Z corresponding to the usual sigma-orbifold fixed-points.
Wess Zumino Couplings for Generalized Sigma Orbifold Fixed-points
Now, the total generalized GS couplings can be obtained by summing the D-brane and generalized sigma orbifold fixed-points contributions.
Wess Zumino Couplings for Generalized Sigma Orbifold Fixed-points
When such new bundle is the SO(10) tangent bundle of the ten dimensional space-time of the superstrings theories, then one can to obtain the WZ couplings for the usual sigma orbifold fixedpoints.
Wess Zumino Couplings for Generalized Sigma Orbifold Fixed-points
When a sigma model formulation of a CFT is available, then the presence of discrete torsion amounts to having a non-trivial action of the orbifold group on the antisymmetric tensor field .
Conformal field theory, boundary conditions and applications to string theory
This would be the SO(n) nonlinear sigma model.
A Six Vertex Model on a Fishnet
In this picture, string interactions appear as vertex operators in the conformal field theory arising as the infrared limit of the sigma model, as discussed in Dijkgraaf, Verlinde, and Verlinde (1997).
M(atrix) Theory: Matrix Quantum Mechanics as a Fundamental Theory
The statistical errors in the calculated values correspond to one-sigma confidence interval.
An Introduction to Monte Carlo Simulation of Statistical physics Problem