What is the term used for a dark line drawn around the edge of a drawing sheet?

The term used for a dark line drawn around the edge of a drawing sheet is "Drawing Border." This border serves multiple important purposes in technical drawings. It provides a defined area that holds the drawing contents, helping to organize information and enhance the overall presentation of the drawing. The border typically also includes relevant details such as the title block, which contains crucial data about the drawing, including the title, scale, and drafting information.

While other concepts listed have their significance in the realm of drafting and design, they do not refer to the specific line surrounding a drawing sheet. Drawing Notes convey essential annotations or instructions; Engineering Drawing is a broader term that encompasses various types of technical drawings; and Extrusion refers to a specific 3D modeling process rather than a component of the drawing format. Therefore, the function and characteristics of a Drawing Border make it the correct answer in this context.