Britannia is an ancient term for Great Britain, which comes from its Latin root describing a collection of islands. By the second century, the Romans had conquered Britannia and the word came to be personified as a Goddess wearing a centurion's helmet, armed with a trident and shield. The depiction of this Goddess has come to symbolize British imperial power and unity, and is why her image graces the reverse of the 2012 Britannia Gold BU coins. The coin's obverse features Queen Elizabeth II.
The first coinage that Britannia was etched into was the English farthing in 1672. In 2008 under some deal of controversy, the British decided to change up and "modernize" Britannia's look to reflect the modern country Britain has become. Produced by the Royal Mint, the 2012 Britannia coins are available in 1/10 ounce size, with a face value of 10 pounds. The coins are 91.67% fine (22-karat gold), with the remaining metal containing silver.