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"С" is a letter in the Cyrillic alphabet, which is used to write Russian and several other Slavic and non-Slavic languages. It represents a consonant sound similar to the "s" in English words like "sun" and is one of the foundational characters for reading and writing in these languages.
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Es, from Alexandre Benois' 1904 alphabet book, with an illustration of sweetness (Slasti) Es (С с; italics: С с or С с; italics: С с) is a letter of the Cyrillic script. It commonly represents the voiceless alveolar fricative /s/, like the pronunciation of ⟨s⟩ in "sand".
Coptic icon of St. Mark, clearly showing examples of lunate sigma from which the Cyrillic Es was derived