The rotation of the plane of polarization may be either clockwise, to the right (dextrorotary — d-rotary), or to the left (levorotary — l-rotary) depending on which stereoisomer is present (or dominant).
Polariseringsplanets rotation kan vara antingen medurs, till höger (dextrorotary-d-rotary) eller vänster (levorotary-l-rotary) beroende på vilken stereoisomer som är närvarande (eller dominant).