Elongated Square Cupola
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Johnson Solid 
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- Debye Functions
- Debye's Asymptotic Representation
- Decagon
- Decagonal Number
- Decagram
- Decic Surface
- Decidable
- Decillion
- Decimal
- Decimal Expansion
- Decimal Period
- Decision Problem
- Decision Theory
- Decomposition
- Deconvolution
- Decreasing Function
- Decreasing Sequence
- Decreasing Series
- Dedekind Cut
- Dedekind Eta Function
- Dedekind Function
- Dedekind Ring
- Dedekind's Axiom
- Dedekind's Problem
- Dedekind Sum