What is the symbol for Hades god of the underworld and of the dead?

Answer 1

One symbol for Hades is Cerberus, the three headed dog that guarded the gates of Hades to prevent the dead, who enter on the river Styx, from leaving. Another object that is associated with Hades is the Cap of Invisibility, also referred to as the Helm of Darkness or the Helm/Cap of Hades. The Cap of Invisibility was given to Hades by the Cyclops. They gave it to him as the gave Zeus his thunderbolts and Poseidon his trident. As the trident is Poseidon's main symbol and thunderbolts are Zeus's, the Cap of Invisibility could be considered Hades's main symbol. The Cap of Invisibility allows the wearer to be invisible to any supernatural beings. The cap has a pair of wings on it, attached to each side of the cap.