Capellini (Italian pronunciation: [kapelˈliːni], literally "thin hair") with its diameter between 0.85 mm and 0.92 mm is a very thin variety of Italian pasta. Like spaghetti, it is rod-shaped, in the form of long strands.
Capelli d'angelo ([kaˈpelli ˈdandʒelo], literally angel hair -- hence, "angel hair pasta" in English) with a diameter between 0.78 and 0.88 mm is an even thinner variant of capellini. They are often sold in a nest-like shape. Capelli d'angelo has been popular in Italy since at least the 14th century. As a very light pasta, it goes well in soups or as "pasta asciutta" with a seafood or other light sauces.