AG is an abbreviation for Adjutant General and Attorney General
Ag is an abbreviation for antigen and is the chemical symbol for silver

AG also means Aktiengesellschaft, which means "Company on shares" in German. Notable examples: Siemens AG, DaimlerChrysler AG, Deutsche Telekom AG, Bayerische Motorenwerke AG (a/k/a BMW), Deutsche Bank AG, BASF AG... oh, and SAP AG of course. Yay for SAP. Yeah right.

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