What does AU stand for?

MLA style: "AU." Acronym Finder . 2012. AcronymFinder.com 26 May. 2012 http://www.acronymfinder.com/Addressee-Unknown-(AU).html
Chicago style: Acronym Finder . S.v. "AU." Retrieved May 26 2012 from http://www.acronymfinder.com/Addressee-Unknown-(AU).html
APA style: AU. (n.d.) Acronym Finder. (2012). Retrieved May 26 2012 from http://www.acronymfinder.com/Addressee-Unknown-(AU).html

Addressee Unknown

This definition appears very rarely and is found in the following Acronym Finder categories:

Other Resources:

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Aberystwyth University (Aberystwyth, UK) About Uncirculated (numismatics; coin condition) Absorbance Unit Access Unit Accessible Unit Acorn User (magazine) Action Unit Adamson University Adaptation Unit Adaptive Unit		Adelaide University (University of Adelaide, Australia) Adelphi University Administrative Unit African Union (formerly Organization of African Unity) Air University (US Air Force) Alcohol Unit Alfred University Aligarh University (India) Alignment Unit Alopecia Universalis

Samples in periodicals archive:

We wrote to the company but our letter was returned addressee unknown.