A crown is often an emblem of a sovereign state, usually a monarchy, but also used by some republics.
Photograph of the physical crown of Norway
The Crown broadly represents the state in all its aspects within the jurisprudence of the Commonwealth realms and their subdivisions. The term can be used to refer to the office of the monarch or the monarchy as institutions; to the rule of law; or to the functions of executive, legislative, and judicial governance and the civil service.
Rideau Hall in Ottawa, Ontario, held in perpetuity by the Canadian monarch, presently Charles III
Balmoral Castle in Aberdeenshire, Scotland, the privately owned property of Charles III
King Charles III (wearing the Imperial State Crown), the living embodiment of the state/crown in each of the Commonwealth realms
The mace of the Parliament of Queensland, symbolising the power of the Australian Crown-in-Parliament