An unusual unit of measurement is a unit of measurement that does not form part of a coherent system of measurement; especially because its exact quantity may not be well known or that it may be an inconvenient multiple or fraction of a base units. This definition is not exact since it includes units such as the week or the light-year, which are quite "usual" in the sense that they are often used but which can be "unusual" if taken out of their common context, as demonstrated by the furlong-firkin-fortnight (FFF) system of units.
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