What does -/10 mean?

Hi, on the forums I’ve been seeing people use terms like “5/10” and 10/10" to describe exploration. Could someone give me a brief idea on what they mean by this?

the difficulty of the escalation site and what ships are involved

https://wiki.eveuniversity.org/Combat_sites#DED_rated_complexes
1-5 highsec
1-6 lowsec
6-10 nullsec

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Difficulty of the site. 10/10 is pretty hard. 3/10 is a breeze.