plus, minus

https://doi.org/10.1351/goldbook.P04701
  1. See: d, l, dl
  2. See: helicity
Source:
PAC, 1996, 68, 2193. 'Basic terminology of stereochemistry (IUPAC Recommendations 1996)' on page 2213 (https://doi.org/10.1351/pac199668122193)