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