Such a number instead of its range whose exact value is unknown is referred to as a greynumber. In applications, a grey number in fact stands for an indeterminate number that take its possible value within an interval or a general set of numbers. This grey number is generally written using the symbol ‘‘⨂"‘‘⨂" There are several types of grey numbers.
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Liu, S., & Lin, Y. (2010). Basic Building Blocks (pp. 19–49). https://doi.org/10.1007/978-3-642-16158-2_2
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