Noun
- The fourth letter of the English alphabet.
- The Roman numeral for five hundred (500).
- Dutch language
- The chemical symbol for deuterium, when deuterium needs to be considered separately from ordinary hydrogen.
- Vehicle distinguishing sign for Germany
D -- Da Db Dc Dd De Df Dg Dh Di Dj Dk Dl Dm Dn Do Dp Dq Dr Ds Dt Du Dv Dw Dx Dy Dz