Not to be confused with pallium, a not often used word, but one that fascinates me so I'll intentionally digress here from the discussion:

PALLIUM (plural: pallia)

"Inflected forms: pl. pal·li·ums or pal·li·a ( pl-)
1. A cloak or mantle worn by the ancient Greeks and Romans. 2. Ecclesiastical A vestment worn by the pope and conferred by him on archbishops and sometimes on bishops. Also called pall1. 3a. The mantle of gray matter forming the cerebral cortex. b. The mantle of a mollusk, brachiopod, or bird.
ETYMOLOGY: Latin. "