[firstcommentyo]

High school physics and math as a major. I could scan you my scripts and papers if you're interested.....no won't. ;-D

But maybe "commonly used" was maybe the wrong term. More appropriately: "sometimes" or "by some".

[renewiltord]

Where in the world? I’ve never used it despite similar background. Perhaps regional?

[IshKebab]

I have never seen it used as not once in maths or physics. "extremely rarely" perhaps.

[mywittyname]

To be fair, there are lot of math symbols out there.

http://mirrors.dotsrc.org/ctan/info/symbols/comprehensive/sy...

There are lots of examples of the lightning bolt in there. In fact, under ulsy Contradiction symbols, there are four variants.

I also noticed the exact symbol being discussed is listed under "Angles".