Hangul syllable Reulb

It combines a consonant, vowel, and final cluster.

The block is built from ㄹ + ㅡ + ㄼ: the syllable 르 followed by the double final cluster ㄼ. In Korean, a final consonant is called a 받침; a double one such as ㄼ is a 겹받침. Its pronunciation depends on the word and its position. “Reulb” is the romanized construction label in the Unicode name, not a Korean translation.

Hangul’s creation was recorded in 1443; the 1446 Hunminjeongeum, a book explaining the new script, described how it works. Korean writing had previously used Chinese characters and systems such as Idu, Gugyeol, and Hyangchal, which adapted those characters to write Korean. Hangul later spread from religious and Confucian books into law, practical texts, letters, labels, and everyday communication.

Why does 륿 show as separate letters?

It is one Hangul syllable shown in separate parts.

A Korean input method editor (IME)—software that builds syllables as you type—combines a leading consonant, vowel, and final cluster. Unicode can also store 륿 as ᄅ + ᅳ + ᆲ; these individual Hangul letters are called jamo. Both forms represent the same syllable, though an app or font may show the parts separately.