95dc162e_Glossary_of_Dance_Terms__m_Dance_Dictionary_from_Webref
Slash [Abbreviations] /
In abbreviated descriptions of dance steps (as opposed to complete sentences), a slash is used to indicate a split beat of music, two steps or actions occuring in a single beat, a kind of syncopation. For instance a cha half basic is "fwd, rec, sd/cl, sd;" In this 4-beat measure, two things are happening on beat 3 (the "side/close"). The "count" is 1, 2, 3/&, 4; The 3/&, 4; is your "cha-cha-cha."
Glossary of Dance Terms
Description Glossary of Terms and Abbreviations from BallroomDancers.com Dance Dictionary from Webref