The Union Jack is the national flag of the UK. It is a combination of the cross of St. George (the patron saint of England), the cross of St. Andrew (the patron saint of Scotland) and the cross of St. Patrick (the patron saint of Northern Ireland)

St. George’s Cross

The Saint Andrew’s Cross

The St. Patrick’s Cross

The United Kingdom of Great Britain and Northern Ireland includes Scotland, Wales, England and Northern Ireland. The symbol of Wales is the red dragon or dragon of Cadwallader.

The Dragon of Cadwallader, symbol of Wales