To my complete suprize and delight, there is a name for that interesting icon seen on electrical distribution physical plants: Mr. Ouch!
I had seen the icon around on various obviously electrical objects in my life, but I never really thought about it. Per the sources cited by WikipediA, it is from at least 1982, possibly earlier.
To me, besides being interesting of itself, it is another example of the depth of planning that went into a thing I just assumed more or less appeared out of thin air. This, for someone trained in engineering, is an embarrassing and improper approach to life.