Hangul syllable Jjelm

It is a Korean syllable block, not a word-level translation. Its three Hangul letters are ᄍ, ᅦ and ᆱ: an initial consonant, a vowel and a final consonant pair. Together they form one syllable. Jamo is the name for letters that combine into Hangul blocks; these parts show the syllable's sound, while the surrounding Korean word gives its meaning.

Hangul's creation notice is dated to 1443; the explanatory book Hunminjeongeum, published in 1446, set out the script's purpose and principles. Formal writing then relied heavily on Chinese characters, and literacy was concentrated among elites. Hangul offered a way to write Korean sounds with a dedicated alphabet.

How do I type 쩲?

Enter the jamo in order with a Korean input method. Type ㅉ, ㅔ, ㄹ, then ㅁ; an input method that composes Hangul turns them into 쩲.

Unicode can also store the same syllable as 쩲 instead of the single block 쩲. The two forms represent the same syllable but have different character sequences, which can matter for exact matching.

What does 쩲 mean when someone sends it alone?

It gives you a syllable, not enough context to infer the message. Read it as Korean text and ask for the word or sentence around it. Its letters show how the syllable is built, but the character alone cannot tell you what the sender meant.