Hangul syllable sweos

It is one Korean syllable, not a word with a fixed meaning.

Hangul blocks combine jamo, the consonant and vowel letters of the Korean writing system. In 쉇, ᄉ is the initial consonant written ㅅ, ᅯ is the vowel written ㅝ, and ᆺ is the final consonant written ㅅ. That final consonant is called batchim. The block gives one syllable; the word's meaning depends on the surrounding spelling and context.

Why are Hangul syllables written as blocks?

Hangul was designed to group speech sounds into syllable units. Its creation is dated to 1443, and the Hunminjeongeum, a guide to its letters and principles, dates to 1446.

Hangul began as a project of the royal court of Joseon, a Korean kingdom, and became the writing system used for Korean. Its consonant and vowel letters, called jamo, are arranged together to make syllable blocks.

How do I type 쉇?

Use a Korean IME and enter the parts in order. Type initial ㅅ, then ㅜ and ㅓ to form ㅝ, then final ㅅ. The IME should combine them into 쉇; if the letters stay separate, check that Korean input is active and that you entered the final consonant.

Unicode treats precomposed 쉇 and the canonical jamo sequence 쉇 as equivalent. Text normalization can combine them into one block. Fonts may change the components' proportions without changing the underlying text.