Penne, meaning "quills" in Italian, are tubes of pasta that have angled ends resembling pen nibs. They are available smooth or ridged (rigate).
For other types of pasta, see angel hair, armoniche, bucatini, cannelloni, cannoli shells, cappelletti, conchiglie, farfalle, fedelini, fettuccine, fusilli, garganelli, gemelli, gnocchi, lasagne, linguine, macaroni, mezzelune, orecchiette, orzo, pappardelle, radiatori, ravioli, rigatoni, ruote, spaghetti, tagliarini, tagliatelle, and tortellini.