What ힻ means
It is an Old Hangul medial vowel, a letter piece used inside a syllable. Hangul’s documentary history records the alphabet’s invention in 1443; the Hunminjeongeum, a manuscript explaining its design, dates to 1446. “Eu-E” describes the vowel combination, not a word spoken by itself.
Jamo are Hangul letter pieces that join to form syllables. This one belongs to the older repertoire, from a writing system designed to make Korean easier to write. The Korean spelling standard adopted in 1933 left obsolete Hangul syllable blocks out of modern spelling; Unicode preserves these historical forms in digital text.
Specialist and archival, not a conversational Korean message.
Don’t substitute it for a modern Korean vowel; it belongs to Old Hangul.
Don't confuse it with
4Questions people ask
1Why can it look like an isolated shape?
It is a conjoining jamo: a vowel piece meant to join other Hangul letters in a syllable. Its position depends on neighboring jamo and the font’s shaping support.
How to type ힻ
ힻ\D7BBCodes and encoding1 code points
A visible symbol can contain several code points. JS .length counts UTF-16 units; UTF-8 counts bytes.