1-13. 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 appear as
     follows:

     Single:
          Dutch/Flemish - enkel (pron. 'ankle')
          French/Walloon - ?
     Double:
          Dutch/Flemish - dubbel (pron. 'double')
          French/Walloon - double (pron. 'doobluh')
     Triple:
          Dutch/Flemish - tripel (pron. 'treepel' or 'trippel')
          French/Walloon - triple (pron. 'treepluh')
     Quadruple:
          Dutch/Flemish - quadrupel (pron. 'quadruple')
          French/Walloon - quadruple (pron. 'quadrupluh')

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