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That's basically what is known as a tri-state checkbox, or a specific rendering of one.
Cool! I didn't do too much research before building this, was inspired by Adam's book where he mentions this system.
In plain text, one form is:

  [ ] undone item
  [-] partially done item
  [x] done item
(They're not unuseful.)
[/] I’ve been using this for partials

[-] But I kind of like this too

I use tilde for in-progress items [~]