Editing Parts-per notation (section)

==Uno (proposed dimensionless unit){{anchor|Uno}}==
Because of the cumbersome nature of expressing certain dimensionless quantities per SI guidelines, the [[International Union of Pure and Applied Physics]] (IUPAP) in 1999 proposed the adoption of the special name "uno" (symbol: U) to represent the number 1 in dimensionless quantities.<ref name="IUPAP" /> In 2004, a report to the [[International Committee for Weights and Measures]] (CIPM) stated that the response to the proposal of the uno "had been almost entirely negative", and the principal proponent "recommended dropping the idea".<ref>{{cite web |title=Report of the 16th meeting (13–14 May 2004) to the International Committee for Weights and Measures, of the International Bureau of Weights and Measures |author=Consultative Committee for Units |date=13–14 May 2004 |url=http://www.bipm.org/utils/common/pdf/CCU16.pdf |url-status=dead |archive-url=https://web.archive.org/web/20140310054340/http://www.bipm.org/utils/common/pdf/CCU16.pdf |archive-date=2014-03-10}}</ref> To date, the uno has not been adopted by any [[standards organization]].