Chain mail is a type of ARMOR that has been used since ancient times. It is made up of small metal rings linked together in a pattern to form a protective garment. The term chain mail is derived from the French phrase 'maille à chaîne, ' which means 'chain mesh.' The most common type of chain mail is known as HAUBERK, which is a long-sleeved shirt made of interlocking metal rings. ARMOR and ARMOUR are also terms used to describe chain mail, with ARMOR being the American spelling and ARMOUR being the British spelling.