- different prime factor numbers function
- difficulty
- diffusion coefficient
- diffusion equation method
- diffusion-limited aggregation model
- diffusion process
- digit
- digital communication
- digital compression JPEG
- digital computer
- digital filter
- digital image
- digital image correlation
- digital image matching
- digital image registration
- digital logic
- digital map
- digital mapping
- digital matrix
- digital photogrammetry
- digital photogrammetry system
- digital photograph
- digital secret communication
- digital secret communication system
- digital signal