Sigma
Videos
Sigma is the eighteenth letter of the Greek alphabet. When it is used at the end of a letter-case word, the final form is used. In Ὀδυσσεύς, for example, the two lowercase sigmas in the center of the
A plaque reading "Metochion of Gethsemane" (Μετόχιον Γεθσημανῆς) in Jerusalem, with a lunate sigma both at the end and in the middle of the word
Es (Cyrillic)
Videos
It commonly represents the voiceless alveolar fricative, like the pronunciation of ⟨s⟩ in "sand".
Sigma
…has a value of 200. In general mathematics, 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. The shape (Σς) and alphabetic position of sigma is derived from the Phoenician letter shin (𐤔…
Es, from Alexandre Benois' 1904 alphabet book, with an illustration of sweetness (Slasti)
Coptic icon of St. Mark, clearly showing examples of lunate sigma from which the Cyrillic Es was derived