BIPM - terminology

SI brochure, from Appendix 1

SI prefixes

	12th CGPM, 1964	decides to add femto and atto to the list of prefixes
	15th CGPM, 1975	decides to add peta and exa to the list of prefixes
	19th CGPM, 1991	decides to add zetta, zepto, yotta and yocto to the list of prefixes

Unit symbols and numbers

decides rules for printing unit symbols

Unit names

abrogates the use of the micron and new candle as units accepted for use with the SI

The decimal marker

decides to allow the use of the point or the comma on the line as the decimal marker

	3rd CGPM, 1901	defines the litre as the volume of 1 kg of water
	11th CGPM, 1960	requests the CIPM to report on the difference between the litre and the cubic decimetre
	CIPM, 1961	recommends that volume be expressed in SI units and not in litres
	12th CGPM, 1964	abrogates the former definition of the litre, recommends that litre may be used as a special name for the cubic decimetre
	16th CGPM, 1979	decides, as an exception, to allow both l and L as symbols for the litre