insignia

arvomerkki, tunnus A patch or other object that indicates a person's official or military rank, or membership in a group or organization.
A symbol or token of personal power, status, or office, or of an official body of government or jurisdiction.
Mary Shelley, chapter 6 in the first part of (w):

The former Protector tendered him the oaths, and presented him with the insignia of office, performing the ceremonies of instalation.