Hangul syllable kas

캇 is a syllable block, not a complete message by itself.

Hangul puts letters together in square syllable blocks. In 캇, ㅋ starts the syllable, ㅏ is the vowel, and ㅅ closes it; one block represents a syllable, not necessarily a whole word.

Hangul was developed in the 15th century to broaden access to Korean writing, when reading and writing Chinese characters was concentrated among the educated elite. The first consonant, ㅋ, was formed from ㄱ with an added stroke for a stronger puff of breath. That explains the consonant, not a separate meaning for 캇.

How do I type 캇?

With Korean input on, enter ㅋ, ㅏ, then ㅅ.

On the standard two-set Korean keyboard, those are Z-K-T on a QWERTY layout. The Korean input method combines them into one block and updates its preview as you type.

The final ㅅ is the syllable-ending consonant, called batchim. At a word’s end it sounds like a final “t”; before a following vowel, it links into the next syllable. Fonts can shape the same block differently without changing which character it is.