A triple of three arbitrary vectors with common vertex (Altshiller-Court 1979), often called a trihedral angle since it determines three
planes.
The vectors are often taken to be unit vectors, and the term trihedron is frequently encountered in the consideration of the unit orthogonal
vectors given by 
,
, and 
(tangent vector, normal
vector, and binormal vector).
See also
Binormal Vector,
Centroidal Line,
Dihedral Angle,
Isoclinal
Line,
Isoclinal Plane,
Normal
Vector,
Orthocentric Line,
Tangent
Vector
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References
Altshiller-Court, N. "The Trihedral Angle." Ch. 2 in Modern
Pure Solid Geometry. New York: Chelsea, pp. 27-41, 1979.Referenced
on Wolfram|Alpha
Trihedron
Cite this as:
Weisstein, Eric W. "Trihedron." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/Trihedron.html
Subject classifications
