Pro Yakyu Spirits Question

I've been playing the series for a few years now, and have a good understanding of everything going on in the game. But the one thing that I still don't get is in the pitcher/batter interface, what the heck are the little blue and pink squares that show up under the pitcher or batter's names and stats and change through out the course of the game? Sometimes it's some katakana, sometimes kanji. One that I see for pitchers a lot has, in katakana,

"SU RO - S"

I'm guessing this has something to do with the pitcher having a slow pitch, maybe a slow curve, or some slider. But these little boxes change and stuff. Anyone know what they are, how you use them if even possible, or even made a list of what they may mean? I've translated the sentence in the instruction manual that briefly talks about it, but it makes so sense to me.

Also, if anyone's interested, I found that you can change the pitcher camera or the batter canera by pressing in the right analog stick...now that I think about it, maybe it's the left stick. But either way, each stadium has different camera angles for the pitcher, it's pretty cool.