The Manx Flag uses the triskelion symbol. The earliest use of this symbol in the island appears on the Manx Sword of State which is thought to date from around 1230.
The island fell under the rule of England in 1341. The island government flew the Union Jack from the 17th century to July 8, 1929, when the triskelion flag replaced it as a local symbol. There were many artistic variations on the design until the flag was standardized in 1966.
The Three Legs device appears on the Manx national flag, armoured in gold and silver and with spurs on the heels, on a red field. This flag, with the addition of the Union flag in the canton, provides the Island's maritime ensign, known technically as "a defaced Red Ensign".
In recent years the Isle of Man Government took steps to protect its long-standing use of the Three Legs as the national emblem. Whilst it does not seek exclusivity in its use, it can prevent others from seeking to register the design as a trade mark exclusive to themselves.