the.com/biretta

A four-cornered hat that turns clergy into walking rank insignia.

means A stiff square cap with three or four ridged peaks worn by Catholic clergy, its color signaling the wearer's rank.

from From Italian berretta, a diminutive of the Late Latin birrus, a hooded cloak or cape — itself possibly of Celtic or Gaulish root, related to words for a reddish-brown cloak. The little cap took its name from the bigger garment, the headgear shrinking out of the cloak across the centuries.

color codes
White for pope, red cardinals, purple bishops, black priests
corner count
Three ridges for clergy, four for academic doctors
the pom
A tuft tops it, except cardinals go bare
name root
Likely from Latin birrus, a hooded cloak
removal rules
Tipped or doffed at specific liturgical moments
for instance

cardinal's biretta — worn by roman catholic cardinals since the 16th century, typically scarlet with three ridges

bishop's biretta — worn by catholic bishops, traditionally purple or black with three ridges, still used in formal liturgy

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