IEC 60027-2

IEC 60027-2

IEC 60027-2 Amendment 2, as published in January 1999, was the first international standard defining the binary prefixes, as proposed by International Electrotechnical Commission (IEC) since 1996 (kibi- (Ki), mebi- (Mi), gibi- (Gi) and tebi- (Ti)) but extended them up to pebi (Pi) and exbi- (Ei). This did not change in the second edition of the standard, published in 2000, but the third edition in 2005 added prefixes zebi- (Zi) and yobi- (Yi). The harmonized ISO/IECIEC 80000-13:2008 standard supersedes subclauses 3.8 and 3.9 of IEC 60027-2:2005. The only significant change is the addition of explicit definitions for some quantities.