What is the name for a perfect nine-dart leg in darts?

A perfect nine-dart leg in darts is called a nine-dart finish.

It is the fewest darts required to complete a standard 501 leg under the usual double-out rules. A player must score 501 exactly, with the last dart finishing on a double or the bullseye. Because the first eight darts must leave a legal final combination, the achievement is exceptionally difficult.

The common route uses two visits of 180, leaving 141, followed by treble 20, treble 19, and double 12. Other routes are possible, including combinations involving the bullseye. The name describes the completed leg, while “nine-darter” commonly describes the player or the achievement.

A nine-dart finish is not simply any leg that happens to use nine darts in a casual format; the scoring format and finishing rules determine whether it qualifies. Professional broadcasts often celebrate one with a special announcement because it combines maximum scoring, precise arithmetic, and a pressure finish.