It's also known as reginette, which means "little queens" — due to its connection to Princess Mafalda.
According to Taste Atlas, mafaldine is good with "game sauces, ragú Napoletano, fish sauces made from seafood or shellfish, and white sauces made from soft cheeses with the addition of ginger, horseradish, or saffron."
There's a similar pasta called tripoline, that's only ridged on one side.