Oh, dude, shapes that start with the letter "p"? Let's see, we've got pentagon, parallelogram, pyramid, and polygon. Like, there are probably more, but those are the ones that come to mind. So, yeah, shapes with a "p" for the win!
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star sphere
polygons perhaps
Maybe only a circle and a oval. :P
Pyramids have some triangular faces.
no number does begin with P...but the first cardinal number to use the letter P is Septillion