binary number system A method of representing numbers that has 2 as its base and uses only the digits 0 and 1. Each successive digit represents a power of 2. For example, 10011 represents (1 × 2^{4}) + (0 × 2^{3}) + (0 × 2^{2}) + (1 × 2^{1}) + (1 × 2^{0}), or 16 + 0 + 0 + 2 + 1, or 19. |