post #2351370 post #1779539 post #217372

Dog tags are a type of necklace that originate from the military. However, they are more commonly being seen as fashion for civilians. Usually attached to a ball chain, they typically feature a name and other personal information inscribed on rounded, rectangular metal plates.
Dog tags were initially made as identification tags for military personnel. When a wearer is injured or killed, the tags are used to identify the body. They usually come in identical pairs so that in the case the casualty can not be moved or has been killed, one could be removed and one could stay with the body.

see also:

• collar_tag, for a tag attached to a pet collar.