BABIP is batting average on balls in play. ISO is Isolated Power. I'm not a huge saber guy, so I'm not really familiar with ISO or RC/27 I explained ISO below, but RC/27 probably needs some explanation as well. RC stands for Runs Created. There are much simpler formulas, but the best one commonly used is RC = [(H+BB-CS+HBP-GIDP) x (TB+(.26 x (BB-IBB+HBP)) + (.52 (SH+SF+SB)))] / (AB+BB+SH+SF+HBP). That's pretty complicated though, so just for fun, the basic formula is. RC = [(H+BB)xTB] / (AB+BB) Essentially, RC/27 is runs created per 27 outs. In other words, if you had an offense entirely comprised of that one player, how many runs would that team score per 9 innings on average? groovy formula...what do SH and TB stand for?