(1) A good reference for band structure analysis is Ashcroft and Mermin
"Solid State Physics." The Greek letters represent the k-points in the
Brillouin zone of your crystal (e.g. Gamma is the center point).
Sorry, but I don't know the answer to your second question.
John Appleton wrote:
Dear all,
(1) I wish to know how the symbols \Gamma, \Delta etc. are
shown the band structure plots.
(2) Secondly I want to know how to plot the Local DOS from label.PDOS.
Is there a post-processing utility or I have to figure it out by myself?
Thank you