A coat of mail is an ancient armor that was quite popular among soldiers. This type of armor was made up of interlocking rings of metal or other materials. It was designed to protect the wearer from sword cuts and projectiles. There are several synonyms for the term 'coat of mail' like mail, hauberk, ring armor, or chainmail. Mail is commonly used to refer to the entire suit of armor while a hauberk is a shorter type of mail that only covers the torso. Ring armor and chainmail are used interchangeably as synonyms for a coat of mail, emphasizing the chain-like construction of the armor.