Among Scandinavian flags, all flags show the Scandinavian Cross (also called Nordic Cross or Crusader's Cross) as illustrated above. The "Cross Flag" is Scandinavia's historic flag pattern showing a + stretching to all four sides of the flag. The vertical bar of the Scandinavian Cross is moved toward the flag's left side.
All Scandinavian countries use this basic traditional design on their flags but individualize their flags in color and other (minor) flag details.

Due to the individualization of the Scandinavian flags, the countries' flags are easy to distinguish.

The very first flag showing the Scandinavian Cross was Denmark's national flag, called the Dannebrog in Danish.