Britannia metal is an alloy of TIN, antimony, and copper. It was invented in 1681 by Englishman Thomas Lote and was named after the Latin name for Britain, Britannia. The term BRITANNIA METAL can be broken down into three crossword solutions: TIN (3 letters), ARNE (4 letters), and RULE (4 letters). TIN refers to the TIN component of the alloy, ARNE is a reference to Thomas Lote, and RULE is a reference to the Latin name for Britain, Britannia.