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The smoot /ˈsmuːt/ is a nonstandard, humorous unit of length created as part of an MIT fraternity prank.
The French scale or French gauge system is commonly used to measure the size of a catheter. It is most often abbreviated as Fr, but can often be seen abbreviated as Fg, Ga, FR or F. It may also be abbreviated as CH or Ch (for Charrière, its inventor).