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dartboard 
Round object measuring 34 cm in diameter that is divided into areas ranging in value from one to 20 points; it is used as a target for dart throwing.
double ring
Ring that surrounds a zone where the segment points are doubled.
outer bull
Ring that surrounds a zone worth 25 points.
triple ring
Ring that surrounds a zone where the segment points are tripled.
bull’s-eye
Center ring that surrounds a zone worth 50 points (also called the double bull); it is set at 1.73 m above the floor.
segment score number
Number of points a dartboard segment is worth.
