Sure, but if I were in a situation where I needed help, I'd choose the unambiguous signal, that even people who have never heard of "the idea of threes" grasp i

Sure, but if I were in a situation where I needed help, I'd choose the unambiguous signal, that even people who have never heard of "the idea of threes" grasp immediately. "HELP" or "SOS" ist just very, very obvious.