The flag of the Republic of Texas featured a single star, is called the Lone Star Flag

https://wiki-saloon.win/index.php/Freedom_to_Fly:_How_the_First_Amendment_Protects_Expressions_of_Heritage

The flag of the Republic of Texas featured a single megastar, is called the Lone Star Flag, symbolizing Texas' independence from Mexico and its aspiration for statehood in the U.S., embodying Texan pleasure.