Often found painted on the Stupas of Tibetan Buddhism, this symbol represents the all seeing eyes of the Buddha, a symbol of the omnipresent compassion of the Bodhisattvas. The small dot depicted between the eyes represents the third eye, a symbol of spiritual awakening. The curious squiggle between the eyes is the Sanskrit numeral one, symbolizing the unity of all things. 
Related Symbols:
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I have a very similar birthmark on my right wrist that resembles the Mark between the eyes, but I don’t know what it is…