The old Earth pub game that Miles O'Brien introduced to Deep Space 9, whose board in Quark's Bar became the centre of his long friendship with Julian Bashir.
Darts is played by throwing small pointed missiles at a numbered circular board. O'Brien, an Irishman fond of the game, sets up a board on the station and teaches Bashir to play.
The board is moved into Quark's Bar in the Deep Space Nine episode Visionary, to the bafflement of the Ferengi and visiting Klingons, and from then on the two friends are regularly seen at it, usually over a drink and an argument. Other characters, including Worf and Dax, occasionally join in.
After Bashir's genetic enhancement is exposed in Doctor Bashir, I Presume, he admits he has been holding back for years. O'Brien insists that in future he must throw from much further away to keep the contest fair.