Pallium n. : A large, square, woolen cloak which enveloped the whole person, worn by the Greeks and by certain Romans. It is the Roman name of a Greek garment.

Pallium n. : A band of white wool, worn on the shoulders, with four purple crosses worked on it; a pall.

Pallium n. : The mantle of a bivalve. See Mantle.

Pallium n. : The mantle of a bird.

Example:
Why does the Pallium worn by Roman Catholic ArchBishops and Bishops have Nimrods Symbol on them?

Taxonomy
pallium, pope, metropolitans, crosses, archbishops, sixth century, the Roman, origin, bishops, omophorion, symbol, the Holy See, pallia, shoulders, office, liturgical, Mass, free encyclopedia.

Defination from the web:
Pallium (anatomy) ... In origin the pallium and the omophorion are the same vestment. ... No other bishops, even non-metropolitan archbishops or retired metropolitans, are allowed to wear the pallium unless they have special permission. ...