Answer:
heading and the title block of the sketch
Explanation:
This mostly depends on the artist but most of the time the top of the page usually contains the heading and the title block of the sketch. The heading is usually the case title and the title block contains important information such as case number, date, artist name, etc. These are usually the two main items that are located at the top of the page. Underneath these points would be the diagram itself, a legend, and a Scale and direction notations (sometimes showing only north)
