The slashed o for diameter mentioned in wikipedia returns the following error when used in a post, regardless of the editor:
500 - Internal server error. There is a problem with the resource you are looking for, and it cannot be displayed. I could probably use the HTML editor and the specific HTML entity #x2300 for it. Let's see if this works here: ⌀ But the point is that I lost all my long post, as it afterwards returned an expired post error. ;( (there's probably an HTML entity for that smiley too...)
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