skoal said:

In my world, which may or may not be your world, BR=Blu-Ray.

Because...

Digital Video/Versatile Disc => DVD, but do folks say Digital Video/Versatile Disc? No. And I hope no one obnoxious chimes in and says they do.

Blu Ray Disc => BRD, but does anyone say Blu Ray Disc? No, folks say Blu-Ray.

Blu Ray => BR

DVD doesn't stand for anything, not "Digital Versatile Disc" and not "Digital Video Disc". CD stood for compact disc, so people took to assuming that the last "D" in DVD must mean disc, which is not necessarily true, so saying a "DVD disc" is not incorrect per se. Thus you are technically correct that by the rules of CD and DVD abbreviation, BRD, BD, or BR should all be correct abbreviations of either "Blu-ray Disc" or "Blu-ray" sans disc. However, it should be said that I am quite partial to "BD" because it goes back to the simplicity of "CD".