A crown is a traditional form of head adornment, or hat, worn by monarchs as a symbol of their power and dignity. A crown is often, by extension, a symbol of the monarch's government or items endorsed by it. The word itself is used, particularly in Commonwealth countries, as an abstract name for the monarchy itself, as distinct from the individual who inhabits it (see The Crown). A specific type of crown (or coronet for lower ranks of peerage) is employed in heraldry under strict rules. Indeed, some monarchies never had a physical crown, just a heraldic representation, as in the constitutional kingdom of Belgium, where no coronation ever took place, the royal installation is done by a solemn oath in parliament, wearing a military uniform: the King is not acknowledged as by divine right, but assumes the only hereditary public office in the service of the law, so he in turn will swear in all members of 'his' federal government. Variations Costume headgear imitating a monarch's crown is also called a crown hat. Such costume crowns may be worn by actors portraying a monarch, people at costume parties, or ritual 'monarchs' such as the king of a Carnival krewe, or the person who found the trinket in a king cake. The nuptial crown, sometimes called a coronal, worn by a bride, and sometimes the bridegroom, at her wedding is found in many European cultures since ancient times. In the present day, it is most common in Eastern Orthodox cultures. The Eastern Orthodox marriage service has a section called the crowning, wherein the bride and groom are crowned as 'king' and 'queen' of their future household.