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Diadem
Symbol of Royalty
Diadem is often associated with royalty and used in contexts relating to kings, queens, and sovereigns. 
Ceremonial Use
The term is commonly used to describe headwear for formal ceremonies, especially ones involving royalty. 
Visual Imagery
When reading, imagine a diadem as a richly decorated headband, often with jewels, to fully grasp its grandeur. 