dihedral angle

https://doi.org/10.1351/goldbook.D01730
The @A00346@ between two intersecting planes on a third plane normal to the intersection of the two planes.
See:
torsion angle
Source:
PAC, 1996, 68, 2193. (Basic terminology of stereochemistry (IUPAC Recommendations 1996)) on page 2206 [Terms] [Paper]