I took this as Batted Balls into a Zone (rated as routine to impossible) and percent of Balls Fielded (in those zones)?
ie BIZ"x"= balls in zone, BIZ"xm"= Balls fielded, BIZ%= percent fielded
So instead of having one all encompassing category of Chances on Batted Balls (not total chances), it is broken down to give a more detailed picture of what type of plays a player is being asked to make.
If that's not right, then I've always been wrong.
As for me, I like BIZ and have a fielding stats view built for it along with changing the default view of fielding stats on the player page to a "BIZ" view.
The nice thing about having a "view" built is if you sort your players by position, say SS, you only get their stats from SS. Without a positions sort you get their total fielding stats.
I don't know if there is a right way to look at this row of stats, but I tend to look first at the "even" balls to see if my fielder is getting at least 50% of those. I then tend to look to the left of my view, ie towards the easier plays to make sure he is covering the routine balls too. Then I look right towards the unlikely and remote balls (especially for my "best" fielders) to see if they are making the extraordinary type plays.