Letter versus operator
Π U+03A0 / ∏ U+220F Σ U+03A3 / ∑ U+2211
The first character on each line is a Greek letter; the second is a mathematical operator.
Copy all 24 Greek letters in uppercase and lowercase, plus final sigma ς. Compare letters with Latin lookalikes and mathematical operators.
U+0391GREEK CAPITAL LETTER ALPHA
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The 24 capital letters in alphabet order.
The 24 ordinary lowercase letters in the same order.
A distinct lowercase form used in word-final position in ordinary Greek spelling.
Both alphabet groups follow the same order. Keep the case used in a formula, and choose final sigma ς where the Greek spelling calls for it.
Π U+03A0 / ∏ U+220F Σ U+03A3 / ∑ U+2211
The first character on each line is a Greek letter; the second is a mathematical operator.
Σ / σ / ς
These are capital, small and small final sigma, all part of one letter family.
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