But that's incorrect. A flag is a flag. It's called a jack when it's on a ship. The American Flag is called the American Jack when it's on a ship. I know 'jack' has slipped into the common colloquial because of Britain's naval tradition, but that doesn't make it right. This isn't a case of language evolving over time, just a case of people getting a proper noun wrong.StuBurns said:Everyone calls it the union jack, there was no need to 'fix it'.