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This seems like a poorly conceived idea.
The idea only if most people don’t recognize that you’re asking for help…. It’s intended to be discrete.
…… except it only works if lots of people know what it means and react appropriately to it….
This system doesn’t work.
…… except it only works if lots of people know what it means and react appropriately to it….
It only requires the staff to know what it means.
It requires every woman who might ever be in trouble understand what it means, but men to be unaware.