The term 'Filbert, for instance' is a reference to a type of NUT. Filberts are also known as hazelnuts and are a popular snack food. They are small, round nuts with a thin, brown shell and a sweet, creamy flavor. They are often used in baking and confectionery recipes, as well as in savory dishes. The term 'Filbert, for instance' is used to indicate that there are other types of nuts that could be used in place of the Filbert.