unit without standard conversion to SI

unit or class of units that can have various definitions and can't be converted to SI units with a single conversion factor. If some of the units in this class can be converted to SI units, specific items should be made for them.

Wikidata entity: Q21684377

P1269	facet of	...	Q12457 (International System of Units)	International System of Units
P279	subclass of	...	Q47574 (unit of measurement)	unit of measurement
P2559	Wikidata usage instructions	Monolingualtext	If some of the units in this class can be converted to SI units, specific items should be made for them.	???

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log id: 4149277