I've often seen a symbol that is used in context of smiling or happy expressions. It is sort of a circle with three lines above it.
Can anyone tell me what it's called and where it comes from?
Example from オトメの帝国
Other examples from the same manga:
example 1,
example 2.
I may be wrong in thinking that it has to do with smiles, but I do think it has something to do with faces.