octal number
nounUK /ˈɒktəl ˈnʌmbə/
US /ˈɑːktəl ˈnʌmbər/
An octal number is a number that uses only the digits 0 to 7.
The octal number 17 is the same as the decimal number 15.
OTHER MEANINGS
2. A numeral written in the base-8 system, often shown with a leading zero in programming.
In many programming languages, 0755 is read as an octal number.
3. A number system used in computing because it groups binary digits in threes.
Computer scientists use octal numbers to shorten long binary strings.
4. Any value expressed using powers of eight.
The octal number 100 equals 64 in decimal.