Hearing loss is an invisible disability. You can't see it. There are 360 million persons in the world with disabling hearing loss.
I've created a "Hearing Impaired" alert pin - people can wear this pin to notify others that they struggle with hearing loss.
The goal of wearing this pin would be to encourage more effective communication strategies when talking to a person with hearing loss and also as a visible sign of hearing loss. This is important especially in emergency situations.