There are none, apart from the fact that people are not familiar with them. Also, there is a risk of confusion with decimal numbers.
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7 and 0
The Octal number system is a numeral system based on the number 8 (as opposed to 10). Interestingly, the cultures that have adopted this system count using the spaces between their fingers instead of the individual fingers themselves.
Octal (base 8) uses the digits 0 - 7.
12
Don't. 889 is not an octal number.