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non SI unit
subjectfact 
non SI unithas value in SI unit2001-09-27 09:32:54.0
has definition not an SI unit, but an important and widely used unit2001-09-27 09:32:54.0
is a kind of unit2001-09-27 09:32:54.0
unithas historical origin2001-09-27 09:32:42.0
represents2001-09-27 09:32:42.0

Kinds of non SI unit :