ha·lo

/ˈheıloʊ/ noun, pl -los or -loes [count]

1 : a circle of light that is shown in a religious painting, drawing, etc., around the head of a holy figure (such as an angel, saint, or god)

— often used figuratively

the child's halo of golden curls

The scandal has tarnished the candidate's halo. [=has damaged his reputation as a morally good person]

2 : a bright circle seen around the sun or the moon