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Gari Ledyard proposes that ㅅ (s) was derived from ㅈ (j) by removing the top stroke. The traditional account* holds that its form is the outline of an incisor, 齒形 (it is the shape of the four ㅅ-teeth in the Chinese pictographic character for incisor, 齒) and Ledyard feels this consideration may have determined the final forms of ㅈ and ㅅ.
* Hunmin Jeongeum Haerye "Explanations and Examples of the Proper Sounds for the Instruction of the People" (1446), defining and explaining the script now known as 한글 (Hangeul), “‘Great script, Korean script’”) in South Korea and 조선글 (Chosŏn'gŭl), “‘Korean script’”) in North Korea.
- 시옷 (siot), a jamo (letter) of the alphabet of the Korean writing system, hangeul; the sibilant phoneme (IPA: /s/)
In the North Korean order, ㅅ (s) is the seventh jamo. In the South Korean order, it is the tenth.
- ㅈ (j) (in traditional account)
- ㅊ (ch)
- Coordinate terms
- ㄷ (d), ㄴ (n)
- 사이시옷 (saisiot) Similar to 's
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