My wife and I have a safe-word. After 4 years married (8 years together) we seem to know each other well and can read each other. But it's an additional comfort

My wife and I have a safe-word. After 4 years married (8 years together) we seem to know each other well and can read each other. But it's an additional comfort to have a safe word we can resort to whenever. Seems like when you're breathless there's not much you can say, but perhaps you can have a safe gesture? Grab your own nose? Or something similarly unambiguous? Good luck and thanks for sharing!