What was the common nickname of the Continental Union Flag, used by the colonies from 1775?

The common nickname of the Continental Union Flag, used by the colonies from 1775, was the Grand Union Flag.

The flag combined the British Union Flag in its canton with 13 alternating red and white stripes representing the United Colonies. It was adopted for use by the Continental forces on December 3, 1775, and served as the de facto national flag before the Stars and Stripes was adopted.

The Continental Union Flag is also called the Cambridge Flag and the First American Flag. Its British canton means it should not be confused with the later flag created by the Flag Resolution of June 14, 1777, which replaced the Union design with a blue field containing stars.

The term Grand Union Flag is especially common in historical accounts, but Continental Union Flag is the formal article title used here. The flag represents the transitional period between colonial resistance and the independent republic celebrated in America250.