wedge projection

https://doi.org/10.1351/goldbook.W06667
A stereochemical projection, roughly in the mean plane of the molecule, in which bonds are represented by open wedges, tapering off from the nearer atom to the farther atom. It is mainly used to illustrate the @C01258@ of larger @C01497@ e.g. cyclotetradecane:
W06667-1.png
equivalent to
W06667-2.png
Source:
PAC, 1996, 68, 2193. (Basic terminology of stereochemistry (IUPAC Recommendations 1996)) on page 2222 [Terms] [Paper]