A hyperbolic version of the Euclidean tetrahedron.
Hyperbolic Tetrahedron
See also
Hyperbolic Cube, Hyperbolic Dodecahedron, Hyperbolic Icosahedron, Hyperbolic Octahedron, Reuleaux TetrahedronExplore with Wolfram|Alpha
References

Referenced on Wolfram|Alpha
Hyperbolic TetrahedronCite this as:
Weisstein, Eric W. "Hyperbolic Tetrahedron." From MathWorld--A Wolfram Web Resource. https://mathworld.wolfram.com/HyperbolicTetrahedron.html