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What the heck is this, and why do the lawyers think it is common enough to need to be represented iconicly?
Being a radio geek of a certain age, I recognized this instantly as a transmitter, despite the fact that transmitters tend not to have that kind of microphone. The concentric circles are the dead giveaway -- that's the radio signal.
The user advocate in me thought, "uh huh, and how many radio geeks of a certain age are there out there?" Even the radio geek in me admits that the answer is "not very many".
A picture may be worth a thousand words, but a thousand words is nine hundred and ninety-six too many when all you want to say is "Don't Use Transmitters Here". (I typically saw signs like this when passing quarries and other construction sites that use radio-controlled blasting caps. Nowadays they usually warn about the use of cell phones instead or in addition.)
But we all know that one in the middle means, "Never use devices with antennae that attract sperm."