What is made of small cord, such as cod line or Belfast cord, and is used to form ornamental lines or lanyards?

The answer is sennit. Sennit is a type of ropework that involves braiding or twisting small cords, such as cod line or Belfast cord, into decorative patterns. It is commonly used in nautical applications for ornamental lines or lanyards. Sennit not only serves an aesthetic purpose but also provides practical benefits, such as creating attractive and functional items like eye splices or hitches.

In contrast, cordage refers broadly to all types of ropes and cords used for various applications, while rope itself generally describes thicker, stronger lines used for heavy-duty tasks. Thread is a much finer material used primarily for sewing and is not suited for the same applications as sennit. Therefore, sennit specifically addresses the context of creating ornamental items, making it the correct choice.