Hangul syllable ssyaels

썘 is one Hangul syllable block. Hangul builds syllable blocks from jamo (letter components): an initial consonant, a vowel, and sometimes a final consonant. In 썘, those positions are ㅆ, ㅒ, and ㄽ. A well-formed block is not automatically a common word, so its parts show how it is written, not a full meaning by themselves.

Hangul was created to write Korean speech directly, since Chinese characters did not fit Korean as closely. Its creation is recorded in 1443; a guide to the new writing system, Hunminjeongeum Haerye, was published in 1446. Those milestones date Hangul, not a separate invention of this syllable.