Flag

1. A piece of cloth, usually rectangular, of distinctive color and design, used as a symbol, a standard, a signal, or an emblem. Salute the American flag as it passes.
2. National or other allegiance, as symbolized by a flag. All ships were of the same flag.
3. A marking device, such as a gummed strip of paper, attached to an object to attract attention or ease identification. All the defective drills were flagged with a yellow marker.