Poseidon is the Greek god of the sea, and NEPTUNE is the Roman equivalent. Poseidon is often depicted as a powerful figure with a trident in his hand, and NEPTUNE is usually shown with a staff and a dolphin. Both gods are associated with the ocean and its creatures, and both are considered to be powerful deities. Poseidon and NEPTUNE are often used interchangeably in mythology and literature, and they are both seen as symbols of strength and power.