What 썜 means
It combines Hangul’s first consonant, a vowel, and a final consonant.
In this block, ㅆ is the initial consonant, ㅒ the vowel, and ㅁ the final consonant.
King Sejong created Hangul in 1443 to make Korean easier to write. The 1446 book 훈민정음 set out the new script’s principles. Before Hangul, Korean writing used Chinese characters adapted to Korean words and sounds. Hangul became Korea’s official writing system in 1894; Japan’s 1910 annexation ended that status.
쌤 is casual; use 선생님 to address a teacher respectfully.
Don't confuse it with
1Questions people ask
1Why does 썜 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 썜
썜\C35CCodes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.