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No, AOD is not another UN sponsored organization. It stands for Adjustable Objective Diameter. Objective Diameter, action length, and barrel taper all come into play when choosing the correct ring height to use.
The AOD is your scope's stated objective diameter, adjusted by any necessary correction factors. With these factors accounted for, you should be ready to choose the best ring height for your application. Swift rifle scopes and most other scope makers sell a wide range of rings to fit any configuration.