The simple version of my question would be: "What is the abbreviation of 'Supervisor'"?
However, I will add some explaining. I am abbreviating the word "operator" as "Op" already (size constraints) so would it be understandable if I abbreviate supervisor as "Sv"?
Sv
is not an abbreviation for supervisor, but if you provide a context, and make it clear, then you can use practically any abbreviation, within a limited target audience.