What does 3rd eye Dr Strange mean?

Doctor Strange in the Multiverse of Madness to release in USA on May 6, 2022  

Doctor Strange's third eye is a manifestation of the Eye of Agamotto (Time Stone) ,  

which was introduced in the Marvel Cinematic Universe as a containment vessel for the Time Stone  

Clea played by Charlize Theron 

Doctor Strange encounters an evil version of himself in a collapsing alternate reality 

This Doctor Strange variant is corrupted by the Darkhold (an evil book of spells last seen in WandaVision)  

and sports a spooky third eye in the center of his forehead to prove it  

Dr Strange 3rd Eye, Meaning, Explained 

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