I saw this idea on a friend's Facebook page, I hope whoever came up with it gets due credit. Great idea!
She said, "Our neighbor is older and lives alone. She has my phone number to call me if she needs helps, but she struggles remembering how to make a call, so I gave her 3 colored pieces of paper for her window which faces our kitchen window. Green is for I'm OK, yellow for need help with an errand, and red for emergency. I call it Isolation Communication."
Let's all look out for each other people.