A crosier or crozier (also known as a paterissa, pastoral staff, or bishop's staff) is a stylized staff that is a symbol of the governing office of a bishop or abbot and is carried by high-ranking prelates of Roman Catholic, Eastern Catholic, Eastern Orthodox, Oriental Orthodox, and some Anglican, Lutheran, United Methodist and Pentecostal churches.
In Western Christianity the usual form has been a shepherd's crook, curved at the top to enable animals to be hooked. In Eastern Christianity, it is found in two common forms: tau-shaped, with curved arms, surmounted by a small cross; or a pair of sculptured serpents or dragons curled back to face each other, with a small cross between them.
Other typical insignia of prelates are the mitre, the pectoral cross, and the episcopal ring.
The origin of the crozier as a staff of authority is uncertain, but there were many secular and religious precedents in the ancient world. One example is the lituus, the traditional staff of the ancient Roman augurs, as well as the Staff of Moses in the Hebrew Bible. Many other types of the staff of office were found in later periods, some continuing to the modern day in ceremonial contexts.
In the Western Church the usual form has been a shepherd's crook, curved at the top to enable animals to be hooked. This relates to the many metaphorical references to bishops as the shepherds of their "flock" of Christians, following the metaphor of Christ as the Good Shepherd.
The Eastern Orthodox and Eastern Rite Catholic crosier is found in two common forms. One is tau-shaped, with curved arms, surmounted by a small cross. The other has a top comprising a pair of sculptured serpents or dragons curled back to face each other, with a small cross between them. The symbolism in the latter case is of the bronze serpent, Nehushtan, made by Moses as related in . It is also reminiscent of the rod of the ancient Greek god Asclepius, whose worship was centered around the Aegean, including Asia Minor, indicating the role of the bishop as healer of spiritual diseases.