For the nationality of merchant vessels, see Flag state.
The flag of Poland, having the state flag variant being charged with the coat of arms. In some jurisdictions or on certain occasions, the state flags are designated to be flown exclusively by governmental authorities and services and restricted from use by civilian and non-governmental parties. Inversely, many states and governments only have a single national flag, or do not have separate civil and state banners.
In vexillology, a state flag is either the flag of the government of a sovereign state (and can also be referred as a government flag and likely interchangeable with a national flag in certain scenarios), or the flag of an individual federated state (subnational administrative division).
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