The difference between the sum of face angles 
at a polyhedron vertex
of a polyhedron and 
,
 |
Angular Defect
See also
Descartes Total Angular Defect, Jump Angle, Spherical DefectExplore with Wolfram|Alpha
Cite this as:
Weisstein, Eric W. "Angular Defect." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/AngularDefect.html