A blue flag may refer to:
- A "blue flag" beach is a beach or marina that meets certain quality standards.
- A blue flag (for racing), tells the driver to pull over to give way to faster cars.
- A blue flag on a locomotive means that it should not be moved because someone is working on it. A blue flag on the track indicates that nothing on the track should be moved.
Also, blue is one of the main colors. Blue, the color of the ocean and sky, often symbolizes peace, stability, inspiration, or wisdom. It is a calming color and can symbolize reliability.
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