Earth-53 is a universe parallel to Earth-1. The name was coined by Typhuss James Kira. To its own citizens, it is called Earth-1. In 2392, Earth-53 was destroyed by a antimatter wave during the Anti-Monitor Crisis but was later restored by Q.
Laurel is Black Canary on Earth-53. Laurel forms her own vigilante team, called Team Black Canary, Laurel and her team fight to protect Star City from crime, corruption and other threats to their city.