Thanks for your replys.
Yes, I was a bit unprecise with my question. Actually, I do know the difference between a shell and a terminal... Anyway, on the UNIX system at my former employer we had the possiblity to start terminals with three different sizes / font sizes etc. in the menu appearing on a right-mouse click. If I edit the profile of the terminal in my current Linux environment, I do not see any possibility to change its default size, so I wonder whether there is a way on how to do this in one of the start scripts.
We are using tcsh because we are just used to it. On one hand this is a very good reason, on the other hand, it very much is not. We are using the shell mainly to run our design tools, perl and tcl. We do not write that many shell scripts. But I will definitely raise the question in our group.