The coffin of Queen Elizabeth II, adorned with the Royal Standard and the Imperial State Crown is pulled by a gun carriage of The King's Troop Royal Horse Artillery during a procession from Buckingham Palace to the Palace of Westminster, London, on September 14, 2022. AFP
The coffin of Queen Elizabeth II, adorned with the Royal Standard and the Imperial State Crown is pulled by a gun carriage of The King's Troop Royal Horse Artillery during a procession from BuckinghamShow more

What is the flag covering Queen Elizabeth's coffin and why's it called the Royal Standard?