<Li> 1 × 10 exactly--in scientific normalized exponential notation; </Li> <Li> 1 E + 3 exactly--in scientific E notation . </Li> <Li> The SI prefix for a thousand is kilo -, with the official symbol k--for instance, prefixed to "metre" or its symbol "m", kilometre or km signifies a thousand metres . As such, people occasionally represent the number in a non-standard notation by replacing the last three zeros of the general numeral with "K": for instance, 30K for 30,000 . </Li> <Li> By the SI writing style, a space can be used as a thousands separator, i.e., to separate the digits of a number at every power of 1 000 . </Li>

Where does the k come from in thousand
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