Igor cwikla
Igor cwikla voted up Echo Jones' answer

The first police badges were the coat of arms worn by medieval knights, these coats of arms were worn by knights on their shields to identify his allegiance to justice. That's why today we call a police badge a shield.

Igor cwikla
Igor cwikla voted up Echo Jones' answer

The first police badges were the coat of arms worn by medieval knights, these coats of arms were worn by knights on their shields to identify his allegiance to justice. That's why today we call a police badge a shield.