Pentagonal Cupola
Johnson Solid 
. The bottom 10 Vertices are
and the top five vertices are
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- Trisectrix
- Trisectrix of Catalan
- Trisectrix of Maclaurin
- Triskaidecagon
- Triskaidekaphobia
- Tritangent
- Tritangent Triangle
- Trivial
- Trivialization
- Trochoid
- Tromino
- True
- Truncate
- Truncated Cone
- Truncated Cube
- Truncated Cuboctahedron
- Truncated Dodecadodecahedron
- Truncated Dodecahedron
- Truncated Great Dodecahedron
- Truncated Great Icosahedron
- Truncated Hexahedron
- Truncated Icosahedron
- Truncated Icosidodecahedron
- Truncated Octahedral Number
- Truncated Octahedron