Siot

Siot (character: ㅅ; 시옷, siot, North Korean: 시읏, sieut) is a consonant of the Korean alphabet. The Unicode for ㅅ is U+3145. Siot indicates an sound like in the English word "staff", but at the end of a syllable it denotes a  sound. Before, semivowels (like ㅛ, yo) and the vowel ㅟ (wi) it is pronounced.