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Octo stands for octopus. A scuba regulator consists of a 1st stage (the part that attaches to the tank) and a 2nd stage (the part you place in your mouth and breathe with.) An octopus is just an extra 2nd stage that is carried in case of an out of air emergency by your dive buddy. If your buddy's breathing system ever fails, he/she can grab your octo and the both of you will breathe off of your tank, each with your own 2nd stage. Your octo is for your buddy, not for you.
Hope this helps!
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