The letter e following a decimal number between 1 (inclusive) and 10 (exclusive) stands for "exponent" and is followed by a positive or negative integer, indicating the power of 10 which, when multiplied by the decimal number, usually represents a very large or very small number.
EXAMPLES
1.34e-6 represents 1.34×10-6=0.00000134; 1.34e7 represents 13,400,000.