The household object Penelope uses as the final test of Odysseus’s identity is their marriage bed.
After Odysseus defeats the suitors and reveals himself, Penelope still fears that the stranger could be a god or impostor. She therefore tells the nurse Eurycleia to move the bed from the bridal chamber. This seemingly ordinary instruction is a carefully designed test.
Odysseus immediately objects because the bed cannot be moved: he constructed it around the living trunk of an olive tree rooted in the ground. He explains its distinctive design, proving that he knows a private detail shared only by the true husband and wife. Penelope then accepts that he has really returned.
The episode is more than a recognition scene. The immovable bed symbolizes the permanence of their marriage, while their mutual intelligence reflects the poem’s theme of testing and recognition. The bow contest tests Odysseus publicly; the bed tests him privately.