Derivations of Pi not related to circles?

Every version of Netscape I’ve ever used supports the symbol font just fine. In fact, I see no reason why any browser would have any more trouble with symbol than with any other font.

Meanwhile, Netscape 4.something which I’m currently using does not recognize the escape sequence.

I’ve got Opera 6.05, but mine didn’t display it as a pi in earlier versions either. I’ve seen the SDMB’s pi character displayed in Opera as a funny-looking “p” in versions 5 and 6, under Win95, WinNT, Win2K, and WinXP.

It looks like a square without the bottom side in Moz 1.0