Saltire

A saltire is a diagonal cross used on flags and in heraldry.^[1]

White saltire in the flag of Gascony

A blue saltire of St Andrew is in the arms of the University of Edinburgh

Examples

The flag of Scotland (named Saint Andrew's cross) has a white saltire on a blue flag.^[2]

The Union Jack (the flag of the United Kingdom) combines the flags of England, Wales, Scotland, and Ireland.^[3] These were the countries that belonged to the U.K. when the Union Jack was created. The Union Jack has two saltires of different colours: a white saltire copied from the flag of Scotland, and a red saltire taken from a flag of Ireland (named Saint Patrick's cross).^[3]