What are the limitations of Code Coverage? — Code Coverage is not a "silver bullet" of software quality, and 100% coverage is no guarantee of a bug-free application. You can infer a certain level of quality in your tests based on their coverage, but you still need to be writing meaningful tests.
What does the name "Clover" mean? — Clover is actually a shortened version of the tool's original name, "Cover Lover", from the nick name that the tool's author gained while writing Clover ("Mr Cover Lover").