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sigma

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

sigma

[′sig·mə]
(invertebrate zoology)
A C-shaped spicule.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

portico

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.

SIGMA

A scientific visual programming environment from NASA.

http://fi-www.arc.nasa.gov/fia/projects/sigma/.
This article is provided by FOLDOC - Free Online Dictionary of Computing (foldoc.org)
References in periodicals archive ?
The difference in our findings may be due to differences in calculating sigma using TEa from different guidelines.
According to study done by Singh Bhawna et al they obtained sigma 6 for TG, CPK-Total and Amylase for both the levels of QC.
In both the studies, the sigma value of one parameter which was in accordance with our result is triglyceride.
We also require upgraded analysers and better methodologies to achieve desired acceptable sigma values for these parameters.
Resources ASQ Six Sigma Forum, www.sixsigmaforum.com I Six Sigma, www.isixsigma.com International Society of Six Sigma Professionals, www.isssp.org JMP, a Business Unit of SAS, www.jmpdiscovery.com Minitab Inc., www.minitab.com Motorola University, http://mu.motorola.com/sigma.shtml QPR Online, www.qpronline.com/sixsigma Quality America Inc., www.qualityamerica.com QFD Institute, www.qfdi.org QPR Online, wwwqpronline.com Rath & Strong Consultants, www.rathstrong.com Six Sigma Academy, www.6-sigma.com Six Sigma Partnering, www.sixsigmapartner.com Six Sigma Qualtec, www.sixsigmaqualtec.com Six Sigma SPC, www.sixsigmaspc.com Smarter Solutions, www.smartersolutions.com Manugistics Inc., www.statgraphics.com StatSoft Inc., www.statsoft.com Industrial Six Sigma
The concept of six sigma in the industrial manufacturing environment is targeted at basically zero defects.
The cost and value of achieving six sigma quality levels for heart pacemakers is indeed substantially different than that for toothpicks.
Successes of six sigma protocols in the manufacturing arena have certainly demonstrated their overall value across the enterprise.
Based on the responses of approximately 400 customers in each year, the researchers used a six sigma analysis to gauge the client's improvement from 1991 to 1992, as well as its performance against its competitors on overall satisfaction and on each of these attributes.
In conducting the six sigma analysis, any performance rating of five or less on the ten-point scale identified a dissatisfied customer.
High-tech manufacturing firm customer satisfaction ratings and sigma levels
1991 1991 1992 1992 mean sigma mean sigma Attributes store level score level