I got the following strategies with my Zorro S version:
Z1
Z12
Z12nfa
Z1fx
Z1nfa
Z1o
Z2
Z2fx
Z2nfa
Z3
Z5

nfa is clear, it complies with the nfa rules. The fx suffix should be for currencies only.
But what is Z1o?
And some people claim to be running, for instance, Z12s.
What's the difference to my Z12?

There are only Z1, Z2, Z3, Z5, and Z12. If you have any other leftover systems from old Zorro versions, delete them. The "s" suffix is for subscribers.