not sure if this has been posted before, but page 7 of the PDF at the below link has definitions for all the parameters that TrackMan mesures. It's not a bad page for reference if you're learning to interpret TM data.
http://www.trackman.dk/download/newsletter/newsletter7.pdf
(from TM newsletter #7. there's a lot of other relevant stuff in there too)
http://www.trackman.dk/download/newsletter/newsletter7.pdf
(from TM newsletter #7. there's a lot of other relevant stuff in there too)