There are three different “infinite symbol” terms I can think of:
The Mobius strip is a twisted figure though sometimes it’s in the shape of a circle and other times twisted like an 8.
The standard mathematical infinity symbol.
The Ouroboros is based on a dragon eating it’s own tail and can be a circle or shaped more like the infinity symbol in math.
I seem to recall there was a video of soothing music that had what looked like a thick wooden mobius circle in one of the Q links. But I don’t think there was another special name for it.