PITIngres From United States of America, joined Dec 2007, 966 posts, RR: 12 Reply 5, posted (4 years 4 months 1 week 2 days 19 hours ago) and read 3587 times:
Quoting Nomadd22 (Reply 3): That's not the symbol I'd expect for RF radiation.
Indeed not. That's the ionizing-radiation symbol. You can crank microwaves up to cooking strength and beyond, but they aren't going to ionize anything. It's either X-rays or above, or a particle emitter such as Nomadd22's hypothesized smoke detector.