Sigma ( ; uppercase Σ, lowercase σ, lowercase in word-final position ς; ) is the eighteenth letter of the Greek alphabet. When used at the end of a letter-case word (one that does not use all caps), the final form (ς) is used. In '''' (Odysseus), for example, the two lowercase sigmas (σ) in the center of the name are distinct from the word-final sigma (ς) at the end.
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Sigma (Σ) is the eighteenth letter of the Greek alphabet with two lowercase forms: σ is used in the middle of words, while ς is used at the end of words. This distinction between middle and final forms is unique to sigma among Greek letters and appears in words like "Odysseus," where the two middle sigmas differ visually from the final sigma.
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18 sectionsContents
- History
- Lunate sigma
- Derived alphabets
- Uses
- Language and linguistics
- Science and mathematics
- Mathematics
- Biology, physiology, and medicine
- Business, finance, and economics
- Chemistry
- Engineering and computer science
- Physics
- Organizations
- Unicode
- See also
- References
- Notes
- Citations
Sigma ( ; uppercase Σ, lowercase σ, lowercase in word-final position ς; ) is the eighteenth letter of the Greek alphabet. When used at the end of a letter-case word (one that does not use all caps), the final form (ς) is used. In ' (Odysseus), for example, the two lowercase sigmas (σ) in the center of the name are distinct from the word-final sigma (ς) at the end.
In the system of Greek numerals, sigma has a value of 200. In general mathematics, uppercase Σ' is used as an operator for summation. The Latin letter S derives from sigma while the Cyrillic letter Es (С) derives from a lunate form of this letter.