A graphical representation of the map key can best be shown with a:

A legend serves a crucial role in map interpretation by providing a graphical representation of the symbols used on the map. It translates the visual elements into understandable information, helping users identify what different symbols or colors signify, such as roads, rivers, buildings, and land use types. Without a legend, a map would lack context, making it difficult for viewers to accurately interpret the data being presented.

A title indicates what the map is about, but it does not convey the meaning of the symbols used. A scale bar shows the relationship between distances on the map and real-world distances, which aids in measuring distance but does not provide insight into the symbolism. A grid can help with navigation or referencing specific areas on the map but does not convey information on what the symbols represent. Therefore, the legend is the most effective tool for summarizing the symbols and their meanings, making it essential for map comprehension.