Look at this graph: The graph shows that the distance travelled and the time taken are proportional, but how do we know that? Notice that the graph is a straight line starting from the origin.
Proportional symbols can be added to a map to show differences between places. The same symbol appears larger or smaller, depending on how something changes.
For example, an I takes up less horizontal space than an M. Proportional spacing is commonly used for almost all text. In this encyclopedia, the default text is a proportional typeface ...
This study demonstrates that plant and fruit volatiles can be organized according to a low-dimensional hyperbolic map, and that within this map exist trajectories that correspond to important ...