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What does "Dubbel" mean on a beer label?

Belgian ales often carry additional wording on their labels indicating their strength. This applies to their original malt strength, not their alcoholic strength. Variations may occur, as shown in the table below:

 

Type	Single	Double	Triple	Quadruple
Dutch/Flemish	Enkel	Dubbel	Tripel	Quadrupel
French/Walloon	-	Double	Triple	Quadruple

Also on the Trappist Ale "La Trappe" you will see the following Latin versions: Angulus, Duplus, Triplus, and Quadruplus.

Source : FAQ of alt.drinks.beer