Hangul syllable Joss

Alone, it has no fixed translation; it is a Hangul syllable.

The Unicode name “joss” is a construction label: it reflects the block’s initial consonant, vowel, and final consonant, rather than translating 좄 as a Korean word. The surrounding word supplies its meaning.

The Hangul alphabet was created in 1443 as a 28-letter system for writing Korean sounds. Before it, methods such as Idu, hyangchal, and gugyeol used Chinese characters to write Korean. The alphabet was introduced as Hunminjeongeum (“Proper Sounds to Instruct the People”) and was also called onmun (“vernacular writing”); Hangeul is its familiar name today. That history belongs to the writing system, not to 좄 as a separately invented sign.

Why does 좄 split into jamo?

It is being shown in an equivalent decomposed form.

NFD represents the syllable as three conjoining jamo: 좄, a leading consonant, a vowel, and a final consonant. NFC composes them back into 좄. Some apps or fonts show the parts separately or arrange them differently inside the block; the encoded text still represents the same syllable.