it's just octal, octodecimal would be something like base 18
The numbers in base just represent the number of different digits you can have before needing double digits (ie 10)
binary: 0, 1, 10 -> 2
octal: 0, 1, 2, 3, 4, 5, 6, 7, 10 -> 8
decimal: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 -> 10
hexadecimal: 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, A, B, C, D, E, F, 10 -> 16 (0x10 hex means 16 in decimal)
