The relationship between lb and log is that lb is a special kind of log, which is essentially the same. In computer algorithm, lb is logbasedbinary, that is, the logarithm with base 2. Lb is often used in computers. Log refers to logarithm. In mathematics, logarithm is the inverse of power, just as division is the inverse of multiplication, and vice versa. This means that the logarithm of a number is an exponent that must produce another fixed number (radix). In a simple example, the logarithmic count factor in the multiplier.