I posted the same question on the TS forum and did not get any help.
You can see that pit and electronic contracts and their symbos at the cbot site:
http://www.cbot.com/cbot/pub/page/0,3181,932,00.html
zn/ty: http://www.cbot.com/cbot/pub/cont_detail/1,3206,1520+14433,00.html...