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A unit for expressing the capacity of memory equal to 2**10 = 1024 characters. If the characters are binary, one K equals 1024 bits. But if there are N kinds of characters, (e.g., 10 numerals of the decimal system, and/or 2 x 26 upper case and lower case letters of standard English) K = 1024 log_2 N bits of storable information. Because N is variable, K is a meaningful quantity only in the context of the knowledge of the number of characters involved. E.g., in English word processing systems, N is determined by the keyboard of the input device. (Krippendorff)
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