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SI brochure, Appendix 1, section 4.1
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12th CGPM, 1964, Resolution 8: SI prefixes femto and atto
Note: New prefixes were added by the 15th CGPM (1975, Resolution 10, given below).
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15th CGPM, 1975, Resolution 10: SI prefixes peta and exa
Note: New prefixes were added by the 19th CGPM (1991, Resolution 4, given below).
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19th CGPM, 1991, Resolution 4: SI prefixes zetta, zepto, yotta and yocto
Note: The names zepto and zetta are derived from septo suggesting the number seven (the seventh power of 103) and the leeter "z" is substituted for the letter "s" to avoid the duplicate use of the letter "s" as a symbol. The names yocto and yotta are derived from octo, suggesting the number eight (the eighth power of 103); the letter "y" is added to avoid the user of the letter "o" as a symbol because it may be confused with the number zero.
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