Cypher will appear on government buildings, documents and some post boxesThe new monarch's monogram was released by Buckingham Palace yesterdayIt consists of the initials of his name Charles and his title, Rex - Latin for KingIt also features the Roman numeral III and a representation of the Tudor Crown
View more: Royal's Mail! First letters franked with King Charles cypher roll off the printer at Buckingham Palace post room... just hours after it is unveiled for first time