Definition from Wiktionary, the free dictionary
ㅅ • (s)
- 시옷 (siot, “siot”), a jamo (letter) of the alphabet of the Korean writing system, hangeul; the sibilant phoneme (/s/)
Both in the South and North Korean order, ㅅ (s) is the seventh jamo.
- Coordinate terms
-ㅅ- • (-s-)
- The sai-siot (사이시옷), genitive marker sometimes placed between a vowel-final syllable and a consonant-initial syllable when forming compounds.