Chain mail

Mail, or chain mail, is a type of armour. It is made of small metal rings linked together in a pattern to form a mesh. The Celts are usually credited with inventing mail armour. Celtic mail was usually made in the form of a vest.
Etymology.
The origins* of the word "mail" are not fully known. One theory is that it originally comes from the Latin word "macula", meaning "spot" or "opacity". Another theory relates the word to the Old French "maillier", meaning “to hammer” (related to the modern English word "malleable"). A mail shirt is a called a hauberk (haubergeon or byrnie). Mail leggings were called chausses. A mail Hood is called a coif and covered the head, neck and shoulders. 
History.
Many scholars think mail was invented by ancient Celts about the 3rd century BC. At that time their iron work was probably the best in Europe. The Romans quickly adopted it for their own army. A shirt of mail armour weighed about . After a battle it was common practice to strip weapons and armour from the dead. Vikings were known to wear mail armor whenever they could get their hands on it. Mail was expensive, time-consuming to make, and required a supply of iron. It became more expensive as improvements were made in materials and workmanship. Mail armour was in use in Europe until the 15th century.
Modern uses.
Mail is today used in gloves to prevent cuts by butchers and firefighters. Some divers wear mail suits when swimming around sharks and particularly when feeding sharks. But mail is heavy and it makes moving around more difficult. Mail is very popular with history reenactors. It is also popular in live action role playing.