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Re:Ask HN: What do you guys use to help organize daily tasks... by tedmiston on Friday September 23, 2016 @06:58PM (#12568528)
That sounds like the Levenger Circa system. I never tried them myself (thought they were too pricy), but they are popular in the GTD crowd.

http://www.levenger.com/circa-notebooks-339.aspx

I did Hipster PDA for a while, which you could kind of consider a poor man's version.

http://www.43folders.com/2004/09/03/introducing-the-hipster-...

Re:Ask HN: What do you guys use to help organize daily tasks... by Jtsummers on Friday September 23, 2016 @07:55PM (#12568739)
The Circa notebooks were my introduction to the concept. Arc is cheaper by a good bit. The rings are slightly different but paper from one will work on the other, maybe not perfectly but functionally.