Rafter, framing & T-bevel are useful types of this "geometric" tool
Archive - Show #5384, aired 2008-01-24 [PAR] Jan 24, 2008 ... A type of cake, or a cone-shaped utensil .... Rafter, framing & T-bevel are useful 
types of this "geometric" tool... [DOC] [TLE] Rafter Tools For Android Apps Calculator [PAR] Rafter Tools is an android app with functions to calculate complex roof framing 
angles that other roof framing calculators don't offer.