This aura around a holy figure's head expresses their glory or divinity and can be seen in art across the world. There are many variants, including rayed haloes (like that on the Statue of Liberty) and flaming haloes (which feature in some Islamic Ottoman, Mughal and Persian art), but the most distinctive and ubiquitous is the circular disc halo. https://www.bbc.com/culture/article/20210623-the-halo-a-symbol-that-spread-around-the-world