Parabiaugmented Dodecahedron
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Johnson Solid 
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- Dixon's Theorem
- D-Number
- Dobinski's Formula
- Dodecadodecahedron
- Dodecagon
- Dodecagram
- Dodecahedral Conjecture
- Dodecahedral Graph
- Dodecahedral Space
- Dodecahedron
- Dodecahedron 2-Compound
- Dodecahedron-Icosahedron Compound
- Dodecahedron Stellations
- Domain
- Domain Invariance Theorem
- Dome
- Dominance
- Domino
- Domino Problem
- Donaldson Invariants
- Donkin's Theorem
- Donut
- Doob's Theorem
- Dot
- Dot Product