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2 definitions found
 for octal
From WordNet (r) 3.0 (2006) :

  octal
      adj 1: of or pertaining to a number system having 8 as its base;
             "an octal digit"

From The Free On-line Dictionary of Computing (30 December 2018) :

  octal
  
      Number base eight.  The octal number
     representation uses the digits 0-7 only, with the right-most
     digit counting ones, the next counting multiples of 8, then
     8^2 = 64, etc.  For example, octal 177 is digital 127:
  
     	digit    weight        value
     	  1     8^2 = 64   1* 64 = 64
     	  7     8^1 =  8   7*  8 = 56
     	  7     8^0 =  1   7*  1 =  7
     			          ---
     				  127
  
     Octal representation used to be widespread back when many
     computers used six-bit bytes, as six-bits can be
     conveniently written as a two-digit octal number.  Since
     nowadays a byte is almost always eight bits long, the octal
     system lost most of its appeal to the hexadecimal system.
     Octal is still found in the C programming language and its
     descendents where it is commonly to represent characters, as
     in 'A' = '\101', 101 being octal for 65, the ASCII
     character code for 'A'.
  
     For a brief discussion on the word `octal' see hexadecimal.
  
     (2017-12-18)
  

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