Gyroelongated Pentagonal Birotunda
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Johnson Solid 
.
- Triakis Tetrahedron
- Trial
- Trial Division
- Trial Divisor
- Triamond
- Triangle
- Triangle Arcs
- Triangle Center
- Triangle Center Function
- Triangle Coefficient
- Triangle Condition
- Triangle Counting
- Triangle Function
- Triangle Inequality
- Triangle Inscribing in a Circle
- Triangle Inscribing in an Ellipse
- Triangle of Figurate Numbers
- Triangle Postulate
- Triangle Squaring
- Triangle Tiling
- Triangle Transformation Principle
- Triangular Cupola
- Triangular Dipyramid
- Triangular Graph
- Triangular Hebesphenorotunda