l

https://doi.org/10.1351/goldbook.L03422
  1. An obsolete prefix for (−)-,
    See: d, l, dl
  2. For like and unlike diastereoisomers
    See: l, u
Source:
PAC, 1996, 68, 2193. 'Basic terminology of stereochemistry (IUPAC Recommendations 1996)' on page 2211 (https://doi.org/10.1351/pac199668122193)