null - opti
- null electrode
- null event
- null hypothesis
- null indicator
- null measurement
- null set
- null space of a linear transformation
- null-form
- null-hypothesis
- null-radical
- null-sequence
- null-series
- null-set
- nullification
- nullifier
- nullity
- nulvatency
- num
- numanese
- numbat
- number
- number domain
- number of exposures
- number of hydroxyl groups
- number of scanning lines
- number of species
- number of thermodynamic degrees of freedom
- number of times
- number system
- numbered aperture
- numeral
- numeration system
- numerator
- numerical analysis
- numerical aperture
- numerical calculations
- numerical code
- numerical computations
- numerical constant
- numerical control
