Amphisbaena

Amphisbaena is the name of the gambling ring Izaya Orihara started in high school with Nakura. Izaya abandoned it when he became bored, and Earthworm, who was previously a representative of Izaya and Nakura but had never met either founder in person, took control and transformed it into a gambling parlor. Amphisbaena become rivals with Heaven's Slave and is later taken over by Dragon Zombie.

Trivia
Amphisbaena possibly gets its name from the creature of Greek mythology, an ant-eating serpent with a head at each end. Its name comes from the Greek words amphis, meaning "both ways," and bainein, meaning "to go." According to Greek mythology, the amphisbaena was spawned from the blood that dripped from the Gorgon Medusa's head as Perseus flew over the Libyan Desert with it in his hand, after which Cato's army encountered it along with other serpents on their march. Amphisbaenae fed off of the corpses left behind.