With help of this tutorial you can rename any icons in s60v3! see it:

 

OK, lets start.

1) Select a folder which you want to rename and press ''options'' so that the option menu is just open:

2) Now without pressing any button or exiting the option menu press the power button (the on/off button) and put your mobile in offline mode:

3) The highlight cursor will select on the first icon with the option menu still opened (Note as options has changed, with the option of rename still present):

4) Now just select the ''rename'' option and rename to what ever you want:

5)You can use various symbols, also copy any symbol from text file and paste it using the copy paste function as usual!

Have Fun!