Off.

Noun

 * 1) (title) Officer.
 * 2) Office.

Usage notes
This is the customary abbreviation of this term as used in case citations to legal periodicals. See, e.g., The Bluebook: A Uniform System of Citation, Nineteenth Edition (2010), "Case Names and Institutional Authors in Citations", Table T13, p. 459.

Quotations

 * Without period., , ,
 * With the period, , ,.