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In page Crozier:

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Croziers used by Western bishops have curved or hooked tops, similar in appearance to staves traditionally used by shepherds, hence they are also known as crooks. In some languages there is only one term referring to this form, such as the German Krummstab or Dutch kromstaf. The crook itself (i.e., the curved top portion) may be formed as a simple shepherd's crook, terminating in a floral pattern, reminiscent of the Aaron's rod, or in a serpent's head. It may encircle a depiction of the bishop's coat of arms or the figure of a saint. In some very ornate croziers, the place where the staff meets the crook may be designed to represent a church.[citation needed]