Hangul syllable Ddyilh

No. It is a Korean text syllable.

The Unicode name describes its parts as ㄸ + ㅢ + ㅀ: ㄸ is a tense initial consonant, ㅢ the vowel, and ㅀ the final consonant cluster. This is a construction recipe, not a word translation; the surrounding Korean spelling supplies the reading and meaning.

Why does 띓 look like this?

It joins three Hangul jamo into one syllable block.

Hangul was made as a practical writing system for people without access to Chinese-character education. Its use widened from commoners’ reading and writing to women’s letters, Buddhist publications, popular novels and official documents; that history belongs to Hangul as a whole, not to 띓 alone.

Older Korean spelling used doubled consonants and final consonant clusters. Modern Hangul retains ㄸ as a doubled initial and ㅀ as a final cluster; 띓 combines both. The earliest surviving account of Hangul’s invention and the completion of Hunminjeongeum, the script’s original guide, fall within 1443–1446; the records do not settle one exact invention date. Unicode represents 띓 as either one precomposed syllable block or an equivalent sequence of conjoining jamo, which fonts and software may display differently.