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 :
... Reformed churches were combined with the Lutherans to form an Evangelical Union in Prussia.
Reformed Church in the Netherlands (NHK)
The Dutch Reformed churches have ...