Hangul syllable Gyeolm

The surrounding Korean word supplies its meaning.

겲 is built from an initial consonant (ㄱ), a vowel (ㅕ), and a final consonant cluster (ㄹㅁ). That structure tells you which syllable is written, but gives the block no separate English gloss. If someone sends only 겲, the block alone does not tell you what role it was meant to play; the surrounding Korean word or conversation supplies that context.

where did 겲 come from?

It belongs to Hangul's system of combining letters into syllables.

Hangul's earliest documentary trail reaches back to the 1443 record of twenty-eight letters; Hunminjeongeum, a book published in 1446, explains their design and how they assemble into syllable blocks. Hangul gave Korean speakers a way to write their language without relying only on Chinese characters. Those dates describe the history of the writing system, not when this exact block first appeared.

how to type 겲

Use a Korean 2-set (Dubeolsik) keyboard layout.

Type r, u, f, a in that order: these keys enter ㄱ, ㅕ, ㄹ, and ㅁ. A Korean IME—the input software that composes Hangul—joins the last two consonants into the final cluster ㄻ and forms 겲. Press space or punctuation to commit the block.

Without a Korean IME, use your app's Unicode-input command; the steps for entering a code point vary by app.