Source : Free On-Line Dictionary of Computing

constructed type
     
        A type formed by applying some {type constructor function} to
        one or more other types.  The usual constructions are
        functions: t1 -> t2, products: (t1, t2), sums: t1 + t2 and
        lifting: lift(t1).
     
        (In {LaTeX}, the lifted type is written with a subscript
        {\perp}).
     
        See also {algebraic data type}, {primitive type}.
     
        (1995-02-03)