The absolute value of an integer is the numerical value without
regard to whether the sign is negative or positive. On a number line it
is the distance between the number and zero.
The absolute value of -15 is 15. The absolute value of +15 is 15
The symbol for absolute value is to enclose the number between
vertical bars such as |-20| = 20 and read "The absolute value of -20
equals 20".