A Halo that's behind the head, instead of above it.
These halos are generally vertically-oriented, and can hang high or low behind the head if they don't encircle the entire head. Depictions of these halos can be found across religious art, such as in traditional Christian or Buddhist iconography, usually appearing as a glow of light or flames.
Do not use this tag for halos that are above one's head at an angle (ex. some depictions of Blue Archive's halos), they have to be mostly vertical and actually behind the head or part of the background.