- duodecimal
- duodecimal arithmetic
- duodecimal digit
- duodecimal fraction
- duodecimal notation
- duodecimal number system
- duodenary
- duo-ring
- duotricenary number notation
- duo-trio test
- Dupin cyclide
- Dupin indicatrix
- Dupin, P.C.F.
- Dupin theorem
- d-uple imbedding
- duplet
- duplicate
- duplicated
- duplicated strategy
- duplicate sample
- duplication
- duplication formula
- duplication of the cube
- duplicatrix
- Dupré, A.L.V.