The Union Jack, also known as the Ulster celebration flag, is a distinctive flag representing the United Kingdom. It features a combination of the national flags of England, Scotland, and Northern Ireland. The flag's design consists of a red cross of St. George (patron saint of England) on a white background, a diagonal white cross of St. Andrew (patron saint of Scotland) on a blue field, and a diagonal red cross of St. Patrick (patron saint of Ireland) on a white background.

The Union Jack is available in various sizes, including the popular dimensions of 5ft x 3ft and 9ft x 6ft. These sizes allow for different uses and occasions, whether it be displaying the flag at a personal residence, public events, or patriotic celebrations.

The flag holds significant historical and cultural importance, symbolizing the unity and diversity of the nations within the United Kingdom. It is often seen during official ceremonies, national holidays, and sporting events involving teams representing the UK.

The Union Jack's distinct design and vibrant colors make it easily recognizable and a powerful emblem of British identity. Whether flown in large or small sizes, it serves as a proud representation of the rich heritage and shared values of England, Scotland, and Northern Ireland.