The Double Top Dart Shop is a Darts Superstore stocking a huge range of products from all the major suppliers including Harrows, Target, Unicorn and Winmau. This is a glossary of terminology used in the game of darts. Where words in a sentence are also . Double-bull: On dartboards configured with a bullseye consisting of two concentric circles, double-bull refers to Double top: The double. Double Top Dart Shop have been trading to passionate #darts fans for over 15 years, supplying top quality dart equipment and related items worldwide.