Σ

Σ englanniksi

1. Σ. Sum over a set of like terms:

\sum_{n=1}^3 n^2 = 1^2 + 2^2 + 3^2 = 14

2. suspension or suspension

3. A class (in the hierarchy|arithmetical hierarchy) of formulae whose outermost unbounded quantifiers are quantifiers

4. The letter sigma ((l)), the 18th letter of the ancient alphabet.

5. (ng). Used as a tally mark, as in ΣΣΣΣ (4 staters) and Τ𐅐𐅏ΣΣΣ (1 talent 18 staters).

6. The case letter sigma (σίγμα), the 18th letter of the modern alphabet|Greek alphabet.

7. The number 200 in numerals|Greek numerals.

8. The number 200,000 in Greek numerals.