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FFF system The Furlong/Firkin/Fortnight (FFF) system is a humorous system of units based on unusual or impractical measurements. The length unit of the system is the furlong, the mass unit is the mass of a firkin of water, and the time unit is the fortnight.〔Stan Kelly-Bootle, "(As Big as a Barn? )", ''ACM Queue'', March 2007, pp. 62–64.〕〔 Like the SI or metre–kilogram–second systems, there are derived units for velocity, volume, mass and weight, etc. While the FFF system is not used in practice, it has been used as an example in discussions of the relative merits of different systems of units.〔〔John D. Neff, "Imbedding the Metric", ''The Two-Year College Mathematics Journal'', Vol. 14, No. 3 (Jun., 1983), pp. 197–202.〕 Some of the FFF units, notably the microfortnight, have been used jokingly in computer science. Besides having the meaning "any obscure unit",〔For example, in Jack G. Ganssle, ''(The art of designing embedded systems )'', 2nd ed., Newnes, 2008, ISBN 0-7506-8644-8, p. 50.〕 the derived unit ''furlongs per fortnight'' has also served frequently in classroom examples of unit conversion and dimensional analysis. ==Base units and definitions==
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