I wasn't sure what would be the best category to put this question in, but here it is:
I'm looking for the special character that symbolizes a lunar halo. The one I've come across is a semicircle divided by a line (shown here: https://commons.wikimedia.org/wiki/File:Symbol_lunar_halo_WMO.svg). However, on some websites this symbol is cited as representing a lunar corona. Those sites list a different image for lunar halo - the semicircle isn't closed, so the character looks like a pitchfork. I can't find a consensus on which of these images represents the corona and which represents the halo. These links demonstrate my confusion:
If anyone can add clarity, or point me to someone who might know, I would really appreciate it!