n.

Etymology 1
Borrowed from.

Noun

 * 1)  nerve

Etymology 2
Abbreviation of or any of its inflected forms.

Adjective

 * 1) New.

Usage notes
This is the customary abbreviation of "note"/"footnote" as used in legal citation. See, e.g., The Bluebook: A Uniform System of Citation, Nineteenth Edition (2010), "Subdivisions", Table T16, p. 472-73.