octal
Java
Number representation in base 8. In base 8, only the digits 0 to 7 are used. Digit positions represent successive powers of 8.
The numbering system using 8 as its base, using the numerals 0-7 as its digits. In programs written in the Java programming language, octal numbers must be preceded with 0. See also hexadecimal.
Perl
A number in base 8. Only the digits 0 through 7 are allowed. Octal constants in Perl start with 0, as in 013. See also the oct function.