Hangul syllable hwagg

It is one Hangul syllable, usually read as part of a word.

Inside the block, ㅎ is the initial consonant, ㅘ the vowel, and ㄲ the final consonant. The syllable is normally one part of a Korean word or name, so the surrounding spelling supplies its meaning.

Hangul was designed to give Korean speakers a learnable way to write their language because Chinese characters did not fit everyday Korean speech neatly. Hangul's creation was recorded in 1443; the book 훈민정음, which explained the writing system, appeared in 1446. Modern Hangul combines initials, vowels, and optional final consonants into precomposed syllable blocks, so even uncommon combinations like 홖 can be written as one block.

What if someone sends 홖 by itself?

It is a Korean syllable, but not a complete word.

If someone sends 홖 by itself, you have one syllable without the surrounding word. Ask which word or text they meant before deciding how it fits.