I'm running Windows XP Home Edition (32-bit) and version 6.10.18 BOINC manager. The only project I am running is climateprediction.net.

In the advanced view of BOINC manager is a tab for statistics. Clicking on that tab bring up a graph, the horizontal axis of which is date, the vertical axis of which simply says "175.00 170.00 165.00 160.00 ..." down to about 140.00 or 145.00.

No definition is given anywhere that I have found, either here or at climateprediction.net, as to what the vertical axis is measuring.

So my two questions are: 170.00 WHAT? and Where on the BOINC manager do I find what the vertical axis is measuring?

They're just credits.
Which ones can be determined by the label at the top, and by which of the several possibilities you click on the left under commands.

They do match the credits, thank you. Of course, I have no idea what the credit is based on or what it is good for, but now I what what the value correlates to.

Wikipedia: BOINC Credit System

And it's for bragging.
"My computer has more credits than yours." Which is apparently popular on the SETI project.