- deltoidal hexecontahedron
- deltoidal icositetrahedron
- deltoid catacaustic
- deltoid evolute
- deltoid involute
- deltoid pedal curve
- deltoid radial curve
- De Mairan, J.B.D.
- demand
- demand analysis
- demand curve
- demand forecasting
- demand function
- demand game
- demand mapping
- demand-responsive transports
- demand theory
- De Marinoni, J.J.
- demiarc
- demi-closed mapping
- demi-continuity
- demi-continuous mapping
- demidegree
- demidegree inward
- demidegree outward