Not trying to derail, but I honestly just learned about the existence of Mercury-symbol from this comment and I'm pretty sure I've never seen it used anywhere b

Not trying to derail, but I honestly just learned about the existence of Mercury-symbol from this comment and I'm pretty sure I've never seen it used anywhere before in my life. I've also never heard of "kill all the elderly" message in general. Can you provide some context examples? Genuinely curious.