Symbols are objects, characters, figures, and colors used to represent abstract ideas or concepts.
The handkerchief symbolizes different things to different characters. Since the handkerchief was the first gift Desdemona received from Othello, she keeps it about her constantly as a symbol of Othello’s love. Iago manipulates the handkerchief so that Othello comes to see it as a symbol of Desdemona herself—her faith and chastity. By taking possession of it, he is able to convert it into evidence of her infidelity. But the handkerchief’s importance to Iago and Desdemona derives from its importance to Othello himself. He tells Desdemona that it was woven by a 200-year-old sibyl, or female prophet, using silk from sacred worms and dye extracted from the hearts of mummified virgins. Othello claims that his mother used it to keep his father faithful to her, so, to him, the handkerchief represents marital fidelity. The pattern of strawberries (dyed with virgins’ blood) on a white background strongly suggests the bloodstains left on the sheets on a virgin’s wedding night, so the handkerchief implicitly suggests a guarantee of virginity as well as fidelity.
As she prepares for bed in Act V, Desdemona sings a song about a woman who is betrayed by her lover. She was taught the song by her mother’s maid, Barbary, who suffered a misfortune similar to that of the woman in the song; she even died singing “Willow.” The song’s lyrics suggest that both men and women are unfaithful to one another. To Desdemona, the song seems to represent a melancholy and resigned acceptance of her alienation from Othello’s affections, and singing it leads her to question Emilia about the nature and practice of infidelity.