What is the meaning of Zucchetto?

A small skullcap worn by Roman Catholic clergy (the Pope's is white, a cardinal's red, a bishop's purple, and a priest's black), Anglican clergy, and Syriac or Malankara Orthodox clergy

zucchetto, calotte (small skullcap worn by Roman Catholic clergy)

diminutive of zucca; zucchini

Source: wiktionary.org