I think it's for Zed to list things we have succeeded at?
I've seen this in other games and I don't know the exact mechanics but I think it's used for advancement of skills at level up.
Something along the lines of
If you use (or perhaps critical pass) a skill during play you tick the skill. Then upon level up you get to roll against that skill (roll over skill so the higher the skill the harder to advance) to see if it goes up. Then you either add a fixed amount to the skill although I suspect its a 1d6 you add on.
Okay someone make me look an arse and fill in with the correct procedure and meaning