The flag was adopted on Feb. 27, 1812. The Bangladeshi flag comprises a red circle on a green background. The red color denotes the rising sun and the sacrifices made by the nation’s people for ...

The Alabama state flag is white with a red cross of St. Andrew ... Washington is the only state with a flag that has a green background. The West Virginia flag has its state motto in Latin ...

So you may already have intuited that a green flag on the beach signals that everything’s OK, while a red flag indicates dangerous conditions. But what exactly are those conditions—and how ...