For those saying about having them in men’s loos too - the male bar men and bouncers if they’ve had training will know what it means anyway.
I also know it was shared by many men on SM (thinking they were helping).
I think the theory behind it is great but many men will know what it means and there is a chance the staff won’t.
I think if you just don’t like the date then make an excuse to leave early.
If you’re concerned for your safety then try and speak to a staff member and tell them directly so they can help you sooner.
There are a few things like this, like using the hand signals if you’re scared and typing in a number when on the phone to 999 if you can’t speak.
Unfortunately, these sorts of things are either so well known that the men know them too and therefore defeats the object or they’re kept more as a secret and then not enough women and staff at the establishments know about them.