Formulas
- Digital image processing
- Digital sundial
- Dihedral angle
- Dijkstra's algorithm
- Dimensional analysis
- Dipole antenna
- Dirac algebra
- Dirac bracket
- Dirac equation
- Direct-quadrature-zero transformation
- Director circle
- Disc integration
- Discrete Hartley transform
- Disjoint-set data structure
- Disk (mathematics)