A national emblem is a symbol that represents a nation. It may or may not appear on the national flag. It is usually something from the natural world, eg. an animal or bird, but can be any object.
The official national emblems of nations of the world in alphabetical order :
... addition to their irreverent behavior, flappers were known for their style, which largely emerged as a result of the musical style of jazz and the popularization of dancing ...