Plan 9 uses Lucida Sans Unicode, which was the OS X system font (as Lucida Grande) until recently. There is a resemblance between this font and Lucida Sans Unicode, they come from the same foundry, after all, but they are significantly different.

> Ironically, the Plan9 folk seem to shun TrueType in favor of bitmap fonts.

It's true Plan 9 uses bitmap fonts, but that's just how the technology was implemented (so you could use BitBlt, etc), there is no shunning of trye type fonts.