Biscione at Castello Sforzesco

The biscione (English: "big grass snake"), less commonly known also as the vipera, is in heraldry a charge consisting of a divine serpent in the act of giving birth to a child. It is a historic symbol of the city of Milan, used by companies based in the city.

Etymologically, word biscione is a masculine augmentative of Italian feminine biscia "grass snake" (corrupted from bistia, ultimately from Latin bestia "beast").

Milan-based auto manufacturer Alfa Romeo (also known as the Casa del Biscione, Italian for "House of the Biscione" or "Biscione['s] marque") includes a biscione in its logo impaled with a red cross on white (derived from the flag of Milan)