what is sigma ??????????

Answer 1

A greek letter..... it can mean population standard deviation. Not sure of other meanings.

Answer 2

Upper case “Σ” (sigma); lower case “σ” (sigma); as the last letter in a word “s”; is the eighteenth letter of the modern Greek alphabet and the nineteenth of the ancient Greek language. In science is usually used to represent the sum of something as well as other scientific factors.

The “c” was used as a sigma during the Byzantine times and it is still used by the Greek Orthodox Church but only in religious writings.

Take it from a Greek!

Have a good one

Answer 3

Sigma (upper case Σ, lower case σ, lowercase in word-final position ς) is the 18th letter of the Greek alphabet. In the system of Greek numerals it has a value of 200. When used at the end of a word, and the word is not upper case, the final form (ς) is used.

The letter is ultimately derived from Phoenician Sin . However, its name derives from Samekh.

In Eastern forms of Greek writing (as opposed to the Western Greek alphabet used in the European Greek colonies) and in the Middle Ages, the lunate sigma (upper case Ϲ, lower case ϲ) — which resembles, but which is not at all related to, the Latin letter C — was often used. Lunate sigma was frequently used for writing Medieval Greek, and it can still sometimes be seen in inscriptions in Greek Orthodox churches, but also in certain printed editions of classical authors. The form of the Cyrillic letter С [s] derives from lunate sigma.

A dotted lunate sigma (sigma periestigmenon, encoded at U+03FE Ͼ) is used by Aristarchus of Samothrace as an editorial sign indicating that the line so marked is at an incorrect position. Similarly, an antisigma (encoded at U+03FD Ͻ) may mark a line that is out of place. A dotted antisigma (antisigma periestigmenon, encoded at U+03FF Ͽ) may indicate a line after which rearrangements should be made, or to variant readings of uncertain priority.

The uppercase form of sigma was borrowed into the Latin alphabet to serve as the uppercase of esh (lowercase: ʃ).

You could get more information from the link below...

Answer 4

Upper case sigma is used to denote "sum" of a set of numbers.

This text box is too limited to clearly show how it is used. As an alternative, look at the wikipedia link in the Science section.

Answer 5

Sigma (upper case Σ, lower case σ, alternative ς) is the 18th letter of the Greek alphabet. In the system of Greek numerals it has a value of 200. When used at the end of a word, and the word is not upper case, the final form (ς) is used.
The 18th letter of the Greek alphabet

Answer 6

Sigma is a Latin character that can represent many things. if you are studying mechanical engineering it could be stress in a component that can be calculated by dividing force by the cross section area of that component. in case you are studying statistic it represents standard deviation of Normal distribution.

Answer 7

i think it's the one that looks like an E kind of. and it means the some of the terms in a sequence. i might be thinking of something else