Hangul Syllable Eulp

Its useful reading comes from the surrounding Korean word, usually 읊다.

In that verb, the stem means voicing or performing text, especially a poem; literary use can also mean composing poetry about a subject. A lone 읊 is not a complete message, so copy it from the palette above only to spell the word.

There is no one-off inventor behind the glyph. The verb is attested in 1456 as 잎다; by the 17th century, vowel change and an added ㄹ before ㅍ produced the modern 읊- spelling. That extra consonant records spelling history rather than an extra sound in 읊다.

Why is 읊 pronounced 읍?

Before a consonant, the final cluster reduces to [ㅂ].

That gives 읊다 [읍따] and 읊고 [읍꼬]. Before a vowel ending, the second consonant moves over: 읊어 [을퍼]. Spelling stays fixed while pronunciation follows Korean 겹받침 rules.

A related form, 읊조리다, keeps that layered history: the National Institute of Korean Language traces it to 15th-century 입주리다, built from older 잎- plus 주리-. The source says the old meaning of 주리- is unknown.