95dc162e_Glossary_of_Dance_Terms__m_Dance_Dictionary_from_Webref
Hyphen [Abbreviations] -
In abbreviated descriptions of dance steps (as opposed to complete sentences), a dash usually represents a pause, nothing happening during a beat of music, at least no step. For instance, a rumba half basic is "fwd, rec, sd, -;" There are four beats in this measure (3 commas and 1 semi-colon) but only three steps. The third step (the side step) occurs over beats 3 and 4.
Glossary of Dance Terms
Description Glossary of Terms and Abbreviations from BallroomDancers.com Dance Dictionary from Webref