A bar near Starfleet's facilities in the San Francisco area, tended by a waitress named Ruby, where the pilots and engineers of the NX warp programme gathered in the 2140s.
The 602 Club is a bar seen in the Enterprise episode First Flight, which looks back to the NX test programme of 2143. It is where Jonathan Archer, A.G. Robinson and the other pilots drink, argue and wait for news.
Several key moments of the flashback take place there. Archer and Robinson come to blows outside after Robinson is chosen for the first warp 2 flight, and Archer meets Charles Tucker, then a young engineer on the project. Over drinks the three plan their unauthorised launch of the second NX prototype.
The waitress Ruby is a fixture of the place. In Shuttlepod One, Tucker and Reed discover that both of them had been involved with her.