Assertion: unit's symbol | /r/HasProperty | accepted for use
Facets:
value: to denote the micrometre
type: PURPOSE
value: officially
type: MANNER
value: in isolation
type: OTHER
Source sentences:
text: The term micron and the symbol μ were officially accepted for use in isolation to denote the micrometre in 1879, but officially revoked by the International System of Units (SI) in 1967.