Cavatappi is macaroni, typically ridged, formed in a helical tube shape that is sometimes described as a “tubular corkscrew”. It’s known by other names, including cellentani, amori, spirali, tortiglioni, fusilli rigati, or scoobi doo. It usually has rigati (lines or grooves on the outside surface of pasta).  In Italian, the word is created by compounding “cava tappi” (”tap extractor" = corkscrew). It is also known as amori, serpentini, trivelle, stortelli, and cellantani.