Which ancient Egyptian symbol was so powerful as a 'brand' that it was strictly controlled, with unauthorized use potentially punishable by death?

In ancient civilizations, certain symbols and 'brands' were widely recognized and carried significant cultural weight. Leaders and institutions used these marks to establish authority and legitimacy - essentially practicing early forms of brand recognition. This poll tests your knowledge about how ancient civilizations developed and utilized recognizable symbols that functioned similarly to modern brands, creating instant recognition and conveying specific messages to their populations.

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The Eye of Horus
The Ankh
The Royal Cartouche (with Pharaoh's name)
The Scarab Beetle