It might stand for "blimished"
When Bear had a bow come out that was less than perfect, they would sell it discounted as a factory secomd or "blemished" rather than put it out at a regular price. Often you can't even find what caused them to call it a "second" butheir quality control inspectoes were diligent about catching slight defects in their production bows.
If the fault was simply in the finish, they often camo painted them and added $5.
If yours is in fact a "blemished bow" don't worry about it. If the bow was not solid they would not let it go out of the factory and take a chance on their reputation being "blemished"
Back then, Bear had a lot of pride in their product. What they (Escalade) is putting out today would probably not be allowed out of the factory.