1. Any notation that uses 16 different characters
   - hexadecimal notation

Type of: mathematical notation

• difficile
• difficult
• difficultly
• difficultness
• difficulty
• diffidence
• diffident
• diffidently
• difflugia
• diffract
• diffraction
• diffraction grating
• diffractive
• diffuse
• diffuse nebula
• diffused
• diffusely
• diffuseness
• diffuser
• diffusible
• diffusing
• diffusing screen
• diffusion
• diffusion pump
• diffusive