- devil on two sticks
- devil’s curve
- devil’s needle puzzle
- devil’s number
- devil’s pitchfork
- devil’s staircase
- De Vries configuration
- De Vries, G.
- dextral set
- dextrorse curve
- dextrorse helix
- dextrorse ruled surface
- dextrorse screw
- dextrorsum curve
- D-finite set
- DF-space
- d-genus
- DG-group
- d-group
- diabolical cube
- diabolic magic square
- diabolic square (= diabolical square)
- diabolo
- diacaustic
- diafix