Which symbol was NOT officially used as a 'brand identity' or emblem of authority by any major ancient civilization?

Before modern logos and branding strategies, ancient civilizations created powerful visual identities that conveyed authority, religious significance, and cultural values. These symbols were meticulously designed and became instantly recognizable across vast empires—functioning much like modern corporate logos. Test your knowledge about these ancient 'brand identities' that have influenced design principles for millennia.

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The double-headed eagle
The winged sun disk
The spiral triangle
The eagle grasping thunderbolts