Hangul syllable heod

Use Korean input: enter ㅎ, then ㅓ, then ㄷ.

A Korean input method editor (IME) joins those letters into one syllable block as you type. On the standard Dubeolsik (two-set) Korean keyboard layout, the keys are G, J, E, in that order. If your layout differs, enter the three letters in order.

What does 헏 mean by itself?

By itself, 헏 is a syllable block; the surrounding Korean text supplies its meaning.

The first record of Hunminjeongeum is dated to 1443; its explanatory book appeared in 1446. Hangul was designed to write Korean speech systematically, arranging an initial consonant, a vowel, and sometimes a final consonant into one block.

When Hangul developed, Chinese characters were also used in Korea. Hangul spells Korean with letters for sounds grouped into syllable blocks; it has a different structure from those characters.