The "sheep" are a reference to the logo of Elaborate Bytes, and the way the rated drive capability in CloneCD.
No sheep = unable to accurately write repeating EFM data patterns - "weak sectors", beaten by Safedisk 2
1 sheep = Writes some EFM patterns ... SD2 up to EARLY 2.5
2 sheep = Writes MOST EFM patterns ... SD2 2.5 (all), 2.6, maybe 2.8
To do SD2.9 requires a better than 2 sheep drive (rare, even rarer in DVD writers).
To go higher still is even tougher, and a region wher results conflict.
So you "amplify weak sectors" (CloneCD) or "Bypass EFM Error" (Alcohol)?
Not quite, it may nudge the capability a step higher, but more often doesn't - in most recent tests, it tends not to deliver any increase in cpability.