What is OPO on a baseball scorecard?

Question

In one particular scorecard I found online, there is a equation that goes AB BB HBP SAC SF = R LOB OPO. Can I assume it means "overall putouts"?

Answer 1

Got me, it could be but I doubt it.  Ive never heard that term in 35 years of playing and watching bball and its not listed in these two sources....I found the sheet you are referring

NOW THAT I THINK ABOUT IT ITS PROBABLY SOME KIND OF PITCH OUT STAT....I dont think its in use too much

http://64.233.167.104/search?q=cache:xt9...