Hangul syllable Oel

It is one Hangul block made from three letters.

Here ㅇ is silent, ㅚ is the vowel, and ㄹ is final.

King Sejong devised Hangul in 1443 so people could write Korean without relying on Chinese characters. The 1446 Hunminjeongeum Haerye guide records ㅚ as ㅗ + ㅣ. In the 15th century, ㅚ sounded like “o-i”; by the late 19th century it had become one vowel spoken with rounded lips. Standard Korean permits that vowel or a smooth sound moving toward “eh.” Unicode can encode 욀 as one character or an equivalent sequence of three Hangul letters.