Ive always known S/O to stand for Strike Outs...so to me, it would be 11 Strike outs. Either the pitcher had a great day, or the batter had a miserable day.
Now, the yellow strip....its embarrassing but typically when I see a yellow strip, it means I didn't quite finish and leaked a bit. Usually, it doesn't require a change until morning though. Now, if its a brown strip, that's a whole different ballgame.
If this isn't helpful, I have no idea what you are seeing.
Marty
2000 F-250 SD,SC,2WD,auto,LB,V-10,3.73
2002 Forest River Wildcat 27RL
1-wife
2-girls (ages 17-13)
1-Dark Red toy poddle (2 1/2 yrs old.....our baby)