Definitions for **"Sigma"**

an electronic verification tracking service that detects video airplays

a verification service that electronically detects airplays of videos distributed to television stations, broadcast networks, and cable networks

See Services, Nielsen Media Research

The Greek letter S, s, or s (English S, or s). It originally had the form of the English C.

The standard deviation or volatility of the price or rate of an instrument, frequently the instrument underlying an option.

an informal name for the standard deviation (see below). The lower case Greek letter sigma is the usual symbol for the standard deviation.

The sigma is a baryon.

(SIG-muh)

a joint initiative of the OECD and the European Union's Phare Programme to support good governance in Central and Eastern Europe

A bacterial transcription initiation factor that promotes association of RNA polymerase to specific initiation sites.

A measure of process performance compared to customer specifications.

A measure of process variability that is calculated by identifying opportunities for defects in a given process, counting the occurrences of defects and calculating defects per million opportunities (DPMO). A Six Sigma-level process produces only 3.4 defects for every million opportunities.

Parameter expressing the seawater density: and equal to 1 minus the density of seawater, measured at a given temperature and at a pressure of l atmosphere.

the symbol , denoting the sum.

sigma is the sum-of-divisors function; sigma(n) is the sum of all the positive integers dividing n. A generalization is sigma_k(n), the sum of all the kth powers of the divisors of n. sigma_k, and thus sigma = sigma_1, is a multiplicative function.

a built-in high-speed geographic information system (GIS) designed for the development and processing of electronic maps

bond a covalent bond in which the electron pair is shared in an area centered on a line running between the atoms.

a member of the Professional Fraternity Association