A line making equal angles with the edges of a trihedron is called an isoclinal line of the trihedron.
Isoclinal Line
See also
Isoclinal Plane, TrihedronExplore with Wolfram|Alpha
References
Altshiller-Court, N. "Isoclinal Lines and Planes." §2.3 in Modern Pure Solid Geometry. New York: Chelsea, pp. 32-37, 1979.Referenced on Wolfram|Alpha
Isoclinal LineCite this as:
Weisstein, Eric W. "Isoclinal Line." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/IsoclinalLine.html