Zeno's Button

Zeno gave the button to Goku after one of their friendly visits, impressed by the Saiyan's boldness in treating the supreme ruler of all existence as a casual friend. The device is deceptively simple in appearance, resembling a small handheld button, but its power is staggering: it provides a direct line to the most powerful being in the multiverse.

The button's most consequential use came during the "Future" Trunks Saga. After Goku, Vegeta, and Trunks failed to defeat Fused Zamasu, and Zamasu's consciousness began spreading across the entire future timeline as Infinite Zamasu, Goku discovered the button in his pocket (having mistaken it for a Senzu Bean earlier). He pressed it and summoned Future Zeno, who promptly erased the entire corrupted future timeline along with Infinite Zamasu, ending the threat once and for all.

The button also features a red side that transports the user directly to Zeno's palace. Goku used this function to visit Zeno and propose the idea of the Tournament of Power, much to Beerus's horror. The God of Destruction threatened to destroy Goku if he pressed the button, fearing what might happen, but Goku tricked him and teleported away. In the anime, Goku even offered the button as payment to Fortuneteller Baba for helping revive Frieza for the Tournament of Power, but she declined, terrified by the sheer power the artifact represented.