Absolute Value or Modulus: The absolute value of a real number x is its non-negative value or distance from zero, demonstrated with |-2| = 2 and |2| = 2 on a number line.
A diagram illustrating the concept of absolute value or modulus, showing a number line with points at -3, -2, -1, 0, 1, 2, and 3, and arrows indicating the distance of 2 units from zero for both |-2| and |2|, with the explanation that the absolute value is the non-negative value or distance from zero.