Octal Number System

 The octal number system is a base-8 number system, which means it uses eight digits - 0, 1, 2, 3, 4, 5, 6, and 7 - to represent all numbers.

In the octal system, each digit has a place value that is a power of 8, just like in the decimal system where each digit has a place value that is a power of 10. The rightmost digit represents the units place, the next digit to the left represents the 8s place, the next represents the 64s place, and so on.

For example, the octal number "73" represents the decimal number:

78^1 + 38^0 = 56 + 3 = 59

Octal numbers are sometimes used in computer programming, particularly in Unix-based operating systems, because they can represent binary numbers using fewer digits. Since each octal digit corresponds to three binary digits, a group of three bits in a binary number can be represented by a single octal digit.

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