U.S. 51 star flag
The 51 Star Flag is a proposed design by the United States's Institute of Heraldry. It will be used if/when the United States adds a fifty-first state to the Union.
The flag features 6 rows of stars, alternating nine stars and eight stars. (Thus 3 rows of 9 (27) plus 3 rows of 8 (24) creates 51 stars.)
An alternate design of a 51-star flag (shown below) is commonly used by the Puerto Rico statehood movement, and features a circular design.

