What is a pickling onion called?

A pickling onion is commonly referred to simply as a "pickling onion." These small, mild-flavored onions are specifically cultivated for pickling due to their size and taste, making them ideal for preservation in vinegar or brine. In some regions, they may also be called "silverskin onions" or "baby onions." Their compact size allows them to retain their crunchiness when pickled, enhancing various dishes and relishes.