A pie piece is a portion of a pie, which is a type of pastry dish that is usually filled with fruit or custard. The three crossword solutions for the term 'pie piece' are radian (6 letters), WEDGE (5 letters), and SLICE (5 letters). A radian is a unit of measurement used in mathematics, and it is also used to describe the shape of a pie piece when cut into a circular shape. A WEDGE is a triangular-shaped piece of a pie, while a SLICE is a rectangular-shaped piece of a pie.