The zucchetto (/tsʊˈkɛtoʊ/;Italian pronunciation: [dzukˈketto; tsuk-]; meaning "small gourd", from zucca, "pumpkin") is a small, hemispherical, form-fitting ecclesiastical skullcap worn by clerics of various Catholic Churches, the Syriac Orthodox Church, and by the higher clergy in Anglicanism. The plural is zucchetti; it is also known by the names pilus, pilos, pileus, pileolus (pileolo), subbiretum, submitrale, soli deo (solideo), berrettino, calotte (calotta).
The zucchetto originated as the Greek pilos and is related to the beret (which itself was originally a large zucchetto). It was adopted circa the Early Middle Ages, if not earlier, to keep clerics' heads warm. Its name derives from its resemblance to half a pumpkin. Its appearance is almost identical to the Jewish kippah (yarmulke), though its significance is quite different.
In the Catholic tradition, the zucchetto is most commonly made of silk or polyester fabric. The design utilises eight triangular panels that are joined to form a hemispherical skullcap. Jutting from the centre of the zucchetto at the top is the "stem", known as stirpis or stirpes. It is made of a twisted loop of silk cord and is meant to make the handling of the zucchetto easier. The stirpes is the primary visual distinction between the zucchetto and the Jewish kippah.