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The French scale, also known as the French gauge or Charrière system, is a widely used measurement system for the size of catheters.It is commonly abbreviated as Fr but may also be abbreviated as Fg, FR or F, and less frequently as CH or Ch (referencing its inventor, Charrière).
The focal point F and focal length f of a positive (convex) lens, a negative (concave) lens, a concave mirror, and a convex mirror.. The focal length of an optical system is a measure of how strongly the system converges or diverges light; it is the inverse of the system's optical power.
2f The F engine is a 3.9-liter, 75/93 kW (105/125 hp), carbureted gasoline engine that is capable of 261/289 N·m (189/209 lb·ft) of torque at 2000 rpm ; the difference in power and torque is different depending on the export destination.
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A fire hydrant marked as 3-inch. The inch (symbol: in or ″) is a unit of length in the British Imperial and the United States customary systems of measurement.It is equal to 1 / 36 yard or 1 / 12 of a foot.
2F may refer to: 2F, the hexadecimal code (in ASCII and Unicode) for the slash character; 2F-Spiele, a German publisher of board games located in Bremen;
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