1-24Table 1-3. —Binary and Octal ComparisonUnit and NumberThe terms that you learned in the decimal and binary sections are also used with the octal system.The unit remains a single object, and the number is still a symbol used to represent one or moreunits.Base (Radix)As with the other systems, the radix, or base, is the number of symbols used in the system. The octalsystem uses eight symbols0 through 7. The base, or radix, is indicated by the subscript 8.Positional NotationThe octal number system is a positional notation number system. Just as the decimal system usespowers of 10 and the binary system uses powers of 2, the octal system uses power of 8 to determine thevalue of a number’s position. The following bar graph shows the positions and the power of the base:8^{3} 8^{2} 8^{1} 8^{0}-18^{-2} 8^{-3}