It is known to English speakers as the French tricolour or the tricolore.
Currently the flag is 50% longer than its width (i.e. in the proportion 2:3) and, except in the navy, has stripes of equal width. Initially, the three stripes of the flag were not equally wide, being in the proportions 30 (blue), 33 (white) and 37 (red). The theory behind this was that if they were equal then the white stripe, being brighter, would appear disproportionately wider to the human eye. Under Napoleon I, the proportions were changed to make the stripes' width equal, but by a regulation dated 17 May 1853, the navy went back to using the 30:33:37 proportions, which it continues to use.
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