What is the term for the national flag of a country?

The term "National Ensign" specifically refers to a country's national flag that is used at sea and in certain official contexts. It serves as a symbol of a nation’s sovereignty and identity, representing the country and its people in various situations, including military and government operations. The National Ensign is prominently displayed on naval vessels, and its design typically includes elements that are unique to that nation, such as colors and symbols.

In maritime usage, the National Ensign is crucial for signaling national presence and authority on the water. This terminology underscores the importance of the flag not only as a symbol of the country but also as a functional item used in specific ceremonial and operational situations. The other terms listed do not convey the same official maritime significance. For example, a State Flag usually represents a specific state within a country, while a Standard Flag could refer to different types of flags that have specific meanings, and a Country Banner may not have a formally recognized definition in the same way.