S̩

S̩ is a letter of the Latin alphabet, formed from S with the addition of a vertical line below it. It is used in Yoruba when written in Nigeria to represent the sound .
The line is sometimes replaced by a dot, i.e. Ṣ ṣ.
is also the International [Phonetic Alphabet] symbol for a syllabic "s" sound.

Computer encoding

does not include precomposed characters for S̩ s̩ — they should be represented with a combining character, which may not align properly or may display as squares in some fonts. Nevertheless, the sequence of base character + combining diacritic is given a unique name.
In Unicode:S̩: + s̩: +