A calavera (Spanish – pronounced [kalaˈβeɾa] for "skull"), in the context of Day of the Dead, is a representation of a human skull or skeleton. The term is often applied to edible or decorative skulls made (usually with molds) from either sugar (called Alfeñiques) or clay, used in the Mexican celebration of the Day of the Dead (Spanish: Día de Muertos) and the Roman Catholic holiday All Souls' Day.

https://en.wikipedia.org/wiki/Calavera