What is the name of the monster with six heads in the odyssey?

In Homer's "The Odyssey," the monster with six heads is named Scylla. She resides in a cave opposite the whirlpool Charybdis and preys on sailors who attempt to navigate the strait between them. Scylla is depicted as a fearsome creature with multiple heads, each capable of snatching a sailor from passing ships. Her presence poses a significant challenge for Odysseus as he journeys back home.