Don’t need to be confuse to get a True Type Font (.ttf) file extension, that is needed to change Symbian S60 v3 mobile phone font type use Font Router. You can find it on your computer.
Find c:\\windows\fonts directory if you use Windows Operating System. I assume c:\\ is system drive and windows\ folder are place where Windows install. If you not sure that are a .ttf font, choose to show extension file type on Folder Option menu in Control Panel (tab View). You will see that are .ttf font or not.
Or you want to find it online… try this Google Search link.