I’ve never seen any types of crochet shell stitches quite like this one before. The Modified Shell Stitch pattern calls for ...

In rowing there are four primary types of shells used: the sculling outrigger, the pair-oared outrigger, the four-oared outrigger, and the eight-oared outrigger. An outrigger is a set of rowlocks ...

There are two main types of structures ... as a garden fence or something much more complex such as a skyscraper. A shell structure has a thin curved outer layer and is hollow.