A single number for users ranking (reputation like)?

Is is possible to generate a single number for each users, as can be seen in stackexchange? This would be nice to define automatic rules to upgrade users between levels. For instance from beginner to experienced with the number 100 adding posts+replies+likes+etc.
Thanks for the very nice tool!

I just discover this topic is discussed here! Apologies for posing this question before seriously searching in the forum!
This said, this reputation figure could be hidden to members to avoid unintended negative effects, and just used in the automatic rule I mentioned. So I rephrase my question, can we define automatic rules for upgrading users between levels?

Rules already exist to move users from trust level 0 all the way to trust level 3.

Could you please point me to the procedure to how to define those rules that?

It’s all at: