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The letter Sigma. Sigma (/ ˈ s ɪ ɡ m ə / SIG-mə; [1] uppercase Σ, lowercase σ, lowercase in word-final position ς; Ancient Greek: σίγμα) is the eighteenth letter of the Greek alphabet.
The summation symbol. Mathematical notation uses a symbol that compactly represents summation of many similar terms: the summation symbol, , an enlarged form of the upright capital Greek letter sigma. [1] This is defined as
the sign of a permutation in the theory of finite groups; the population standard deviation, a measure of spread in probability and statistics; a type of covalent bond in chemistry ; the selection operator in relational algebra; stress in mechanics; electrical conductivity; area density; Cross section. nuclear cross section
In mathematical analysis and in probability theory, a σ-algebra ("sigma algebra"; also σ-field, where the σ comes from the German "Summe" [1]) on a set X is a nonempty collection Σ of subsets of X closed under complement, countable unions, and countable intersections. The ordered pair (,) is called a measurable space.
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"Sigma” is a slang word for “the best” or someone who is a humble alpha male. ... a special education math teacher in ... The teen version of “mewing” is a “hush” symbol and touching ...
The teen version of “mewing” is a “hush” symbol and touching the jawline to mean, “I can’t talk.” Lindsay tells TODAY.com that “sigma” is a classroom trend.
Symbol Name Meaning SI unit of measure alpha: alpha particle: angular acceleration: radian per second squared (rad/s 2) fine-structure constant: unitless beta: velocity in terms of the speed of light c: unitless beta particle: gamma: Lorentz factor: unitless photon: gamma ray: shear strain: radian