Dislosure: I'm not directly from the fields of the Sciences Of Angles And Ambiguously Crossing Lines nor I've every seen or used this symbol before. However to me it's, pretty evidently, supposed to be a "no right angle" symbol. (A) It's in the math section, (B) it's with angles, (C) the thunderbolt ↯ is commonly used for "not" or more specifically for dis-proof in this area and (D) at least by my 30 s internet searc…
Right angles have a small box near the vertex which denotes it is a right angle [0]. This symbol doesn't have that box, so I don't think it's a right angle. [0] https://en.wikipedia.org/wiki/Right_angle#/media/File:Right_... Edit: This merely adds to the confusion, since the name of the glyph contains the words "right angle." ¯\_(ツ)_/¯
The article notes that sans a given meaning the glyph was given a “descriptive name”.
So you’re not wrong? :-P