d, l, dl
[obsolete]
https://doi.org/10.1351/goldbook.D01513
Obsolete (usage strongly discouraged) alternatives for, respectively, the prefixes (+)- and (−)- [used to designate the sign of
optical rotation
of enantiomers
under specified condition (and hence to distinguish the enantiomers)] and (±)- for a racemate
.