This timeline of binary prefixes lists events in the history of the evolution, development, and use of units of measure which are germane to the definition of the binary prefixes by the International Electrotechnical Commission (IEC) in 1998, used primarily with units of information such as the bit and the byte. Historically, computers have used many systems of internal data representation, methods of operating on data elements, and data addressing. Early decimal computers included the ENIAC, UNIVAC 1, IBM 702, IBM 705, IBM 650, IBM 1400 series, and IBM 1620. Early binary addressed computers included Zuse Z3, Colossus, Whirlwind, AN/FSQ-7, IBM 701, IBM 704, IBM 709, IBM 7030, IBM 7090, IBM 7040, IBM System/360 and DEC PDP series. Decimal systems typically had memory configured in whole decimal multiples, e.g., blocks of 100 and later 1,000. The unit abbreviation 'K' or 'k' if it was used, represented multiplication by 1,000. Binary memory had sizes of powers of two or small multiples thereof. In this context, 'K' or 'k' was sometimes used to denote multiples of 1,024 units or just the approximate size, e.g., either '64K' or '65K' for 65,536 (216). 1790s 1793 The French Commission temporaire de Poids & Mesures rêpublicaines, Décrets de la Convention Nationale, proposes the binary prefixes double and demi, denoting a factor of 2 (21) and (2−1), respectively, in 1793. 1795 The prefixes double and demi are part of the original metric system adopted by France (with kilo for 1000) in 1795. These were not retained when the decadic SI prefixes were internationally adopted by the 11th CGPM conference in 1960. 1870s Metric prefix established in 1873. 1930s Metric prefixes "kilo-" (established 1795) and mega- (established 1873) are widely used as decimal multipliers 1,000 and 1,000,000 for units of frequency and impedance in the electronics industry. The Committee of the Verband Deutscher Elektrotechniker publishes suggested names and symbols for the metric prefixes with decimal meaning, i.e., giga (G=109) and tera (T=1012). 1940s 1943–1944 J. W. Tukey coins the word "bit" as an abbreviation of "binary digit". 1947 "The Whirlwind I Computer is planned with a storage capacity of 2,048 numbers of 16 binary digits each." 1948 Tukey's "bit" is referenced in the work of information theorist Claude Shannon. 1950s In the 1950s, "1 kilobit" meant 1000 bits: "In the '50s, amazingly enough—and only total coincidence—I actually was given the job of writing the operational specifications [...] for