It means that the absolute value of the number is in the range (0, 1).
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It means that the decimal point has to move to the left.
That indicates a decimal; a number less than one.
5E-5 is scientific notation representing the number 5 multiplied by 10 raised to the power of -5. This can be expanded to 0.00005 in standard decimal notation. The "E" in 5E-5 stands for exponent, indicating the number of decimal places the decimal point should be moved to the left (negative exponent) or right (positive exponent).
the exponent is a negative
Scientific notation : 2.5 x 10^10 = 25,000,000,000