Point at Infinity
is the point on the line 
such that 
. It can also be thought of as the point ofintersection of two Parallel lines.
References
Behnke, H.; Bachmann, F.; Fladt, K.; and Suss, W. (Eds.). Ch. 7 in Fundamentals of Mathematics, Vol. 3: Points at Infinity. Cambridge, MA: MIT Press, 1974.
- Tetrabolo
- Tetrachoric Function
- Tetracontagon
- Tetracuspid
- Tetrad
- Tetradecagon
- Tetradecahedron
- Tetradic
- Tetradyakis Hexahedron
- Tetraflexagon
- Tetragon
- Tetrahedral Coordinates
- Tetrahedral Graph
- Tetrahedral Group
- Tetrahedral Number
- Tetrahedral Surface
- Tetrahedroid
- Tetrahedron
- Tetrahedron 10-Compound
- Tetrahedron 5-Compound
- Tetrahedron Inscribing
- Tetrahemihexacron
- Tetrahemihexahedron
- Tetrakaidecagon
- Tetrakaidecahedron