Abbreviation for octal. Used in computer science and mathematics. The octal number system is a base eight number system, meaning there is no 8 or 9 digit used.
For example the number 9 would be written as 11, because there is no 8 or 9.
Mathematicians often confuse Christmas and Halloween because DEC 25 = OCT 31
(decimal 25 = octal 31)
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