Final answer:
The orientation of a map, which helps users understand which direction is which, is typically determined by a compass rose. While elements like a grid pattern, legend, or index aid in reading a map, they do not determine its orientation.
Step-by-step explanation:
A map's orientation is typically determined by a compass rose. The compass rose, which often appears in the corner of a map, displays the cardinal directions: North, South, East, and West. This helps users understand which direction is which on the map. 120 is not related to this question as it may be a misplaced term and does not have a context with respect to map orientation.
Other elements like a grid pattern, legend, or index support the process of reading and understanding a map but do not determine its orientation. A grid pattern is a system of horizontal and vertical lines that provide coordinate locations, while a legend explains what the symbols on the map represent, and an index helps to find specific locations on the map.
Learn more about Map Orientation