What 샟 means
ᄉ, ᅢ, and ᆾ form one Korean syllable block.
The Unicode decomposition is ᄉ + ᅢ + ᆾ. These individual Hangul letter units are called jamo: ᄉ opens the syllable, ᅢ is its vowel, and ᆾ is the final form of ㅊ. Before a pause or consonant, final ㅊ sounds like an unreleased t; before a following vowel, it carries into the next syllable and sounds roughly like the ch in chin.
When was Hangul created?
King Sejong created Hangul in 1443; its guide appeared in 1446.
The book, Hunminjeongeum, explained the script’s purpose and principles. Hangul groups Korean consonants and vowels into compact syllable blocks. Some scholarship links that square layout to Chinese-character writing; this is a proposed influence on the layout, not an explanation of the meaning of 샟.
Questions people ask
1Why does 샟 show as a box on some devices?
Because that device's fonts have no glyph for it. The character is still correct and still copies correctly — the box is a missing glyph, not a broken character.
How to type 샟
샟\C0DFCodes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.