*S refers to Song, a song that is popular in it’s place of origin, but is not associated with any particular dance. However, recreational folk dancers do associate the song with a dance, a generic or 2nd Generation dance that they name after the song.
See Što Mi E Milo here
https://folkdancefootnotes.org/music/sto-mi-e-milo-macedonia-bulgaria/
Folkdance Footnotes 