Heraldry of the House of Habsburg
The coats of arms of the House of Habsburg were the heraldic emblems of their members and their territories, such as Austria-Hungary and the Austrian Empire. Historian Michel Pastoureau says that the original purpose of heraldic emblems and seals was to facilitate the exercise of power and the identification of the ruler, due to what they offered for achieving these aims.
Source: Wikipedia — Heraldry of the House of Habsburg (CC BY-SA 4.0)