I was just checking my site stats and came across this gem to explain what is called the Akismet Ham Stat:
What the heck is ham doing on my blog? I’m a vegetarian.
Spam most people know as the unwanted commercial comments on their blog, its counterpart we call ham to indicate legitimate comments. On the Akismet mistakes side, missed spam is pretty self-explanatory, but a false positive is what it’s called when we incorrectly identify a legitimate comment as spam. (Which hopefully happens very rarely.) Also, we’re sorry about the vegetarian thing.
That, along with the great interface and the cute little smile at the very bottom of every page – bet you hadn’t noticed that – is why I love wordpress.