Here’s what the hole in a safety pin is really for

In high school, I pierced my navel with a safety pin. (Do not recommend.) These days, I prefer to wear them as earrings—I’m ...
Indiatimes

Have you ever wondered why safety pins have a hole

The safety pin is a small domestic object that appears settled and complete, yet it carries a design feature that invites repeated questions. The circular hole at the end of the clasped arm has ...