ss w/ = "supersetted with". So I do a bench set, then a row set, then a bench set, and so on until I'm done.
I like supersetting, especially opposite exercises as it just feels right, but also because it makes the workout go faster. I usually do 2-3 min rest between sets of bench for example, so bench could take like 20 minutes on it's own, or more even on a heavy day. Then I'd have to spend some time rowing too.
Another advantage is it balances the muscles around your shoulders so that you're working both sides equally, which is important for shoulder health.
But, if I superset stuff, it's adifferent muscle so it kind of combines the rest periods. I bench, then stroll over to the rows to row, stroll back and I'm benching again in about 3 minutes and I knocked the rows out too.
For stuff like curls and whatever, it goes even faster than that as they are just a single muscle worked and barely any rest needed.
Hmmm.... long winded as usual! I probably should learn to superset my answers!