N-
# N-

## Chemistry

* n-, a lowercase prefix in chemistry denoting the straight-chain form of an open-chain compound in contrast to its branched isomer
* N-, an uppercase prefix in chemistry denoting that the substituent is bonded to the nitrogen, as in amines

## Mathematics, science and technology

The italicized letter n is used in mathematics to denote an arbitrary number (usually a non-negative integer).

* n-ary associativity
* n-ary code
* n-ary group
* n-back
* n-body problem
* n-category
* n-category number
* n-connected space
* n-curve
* n-dimensional space
* n-dimensional sequential move puzzle
* n-electron valence state perturbation theory (NEVPT)
* n-entity
* n-flake
* n-gram
* n-group
* n-monoid
* n-player game
* n-skeleton
* n-slit interferometer
* n-slit interferometric equation
* n-sphere
* n-vector
* n-vector model
