Bansiot
Bansiot, sometimes called samgakhyeong, is an archaic consonant letter of the Korean alphabet, Hangul. In Unicode, its name is spelled pansios, following the ISO/TR 11941 romanization system. Its sound value is disputed, but most scholars believe it to have been the voiced alveolar fricative in Middle Korean. It fell out of use around the late 16th century, as its corresponding phoneme disappeared from the language.
Description
ㅿ was a voiced equivalent of ㅅ. Its use was generally restricted to the word medial position, although it was sometimes used as the first initial consonant of a word. It was used in the initial position to represent some Late Middle Chinese sounds, like ᅀᅵᆯ or ᅀᅵᆫ ; when used for such cases, its Sino-Korean pronunciation was possibly. Early Hangul texts sometimes used it similarly to the saisiot; for example, 太子 ㅿ 位 appears in Yongbiŏch'ŏn'ga. This type of usage eventually disappeared.ㅿ fell out of significant use to represent Korean by around the 1570s to 1580s. By this point, its corresponding phoneme had disappeared out of the language. In many cases, its sound simply ceased to be used in words; for example, Middle Korean ᄆᆞᅀᆞᆶ has since become 마을 in modern Standard Korean. In a subset of cases, the loss of ㅿ across adjacent vowels resulted in a simpler word with a long vowel. For example, 기ᅀᅳᆷ〮 김. In rare cases, it was replaced with a ㅅ. Its role eventually came to be replaced by ㅇ. It continued to see some limited use for the transcription of foreign languages thereafter.