The set of binary prefixes that were eventually adopted, now referred to as the "IEC prefixes", were first proposed by the International Union of Pure and Applied Chemistry's (IUPAC) Interdivisional Committee on Nomenclature and Symbols (IDCNS) in 1995. At that time, it was proposed that the terms kilobyte and megabyte be used only for 103 bytes and 106 bytes, respectively. The new prefixes "kibi" (kilobinary), "mebi" (megabinary), "gibi" (gigabinary) and "tebi" (terabinary) were also proposed at the time, and the proposed symbols for the prefixes were kb, Mb, Gb and Tb respectively, rather than Ki, Mi, Gi and Ti. The proposal was not accepted at the time.