C
The Greek alphabet, which is derived from the Phoenician alphabet, is the script used by the Greeks since the 8th century BC. The Greek letter before sigma is rho.
The Greek capital letter for Sigma is Σ.
Sigma is actually the letter S in the Greek alphabet and can mean anything that begins with the letter S.
The letter between pi and sigma in the Greek alphabet is rho.
Tau
"S" Sigma is the name of the 18th letter of the Greek alphabet.
The letter ς is called "sigma" and is the lowercase form of the Greek letter Σ (sigma). In modern Greek, it represents the "s" sound, while the uppercase Σ represents the same sound at the beginning of a word or in all-caps text. However, in ancient Greek, the letter ς (sigma) was only used at the end of words, while the letter σ (sigma) was used elsewhere
The Greek letter sigma is used to denote a selection operation: select * from foo where bar = 10;
In physics, the sigma letter (Σ) represents summation. It is used to denote the sum of a series of terms.
sigma...the next greek letter
The Greek letter /, /, or / (English S, or s). It originally had the form of the English C.