By convention, a broken wedged line denotes a bond projecting behind the plane of the paper and a solid wedged line denotes a bond projecting in front of the plane; a normal line denotes a bond
lying in the plane.
This HTML reproduction is as close as possible to the published version [see IUPAC, Commission on Nomenclature of Organic Chemistry. A Guide to IUPAC Nomenclature of Organic Compounds
(Recommendations 1993), 1993, Blackwell Scientific publications, Copyright 1993 IUPAC]. If you need to cite these rules please quote this reference as their source.
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