What 캢 means
It represents one Korean syllable; the word supplies meaning. Split into Hangul letter parts, 캢 is ᄏ + ᅢ + ᆹ: an initial consonant, a vowel, and a final consonant cluster. These building letters are called jamo.
Hangul was designed for Korean
King Sejong created Hangul for writing Korean in Joseon; its creation is recorded in 1443. An explanatory book called Hunminjeongeum was published in 1446 and describes the script’s purpose and how its letters form syllables. Hangul syllable blocks also appear in metal movable type from 1455—reusable pieces for printing.
Questions people ask
1Why does 캢 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 캢
캢\CEA2Codes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.