Pyramid diagrams are visual representations of data that are organized in a triangular shape. They are used to illustrate hierarchical relationships between different elements, such as in a company's organizational structure or a product's sales performance. Pyramid diagrams are also used to show the relative importance of different elements in a
A population pyramid or "age-sex pyramid" is a graphical illustration of the distribution of a population by age groups and sex; it typically takes the shape of a pyramid when the population is growing. Males are usually shown on the left and females on the right, and they may be measured in absolute numbers or as a percentage of the total population. The pyramid can be used to visualize the age of a particular population. It is also used in ecology to determine the overall age distribution of a population; an indication of the reproductive capabilities and likelihood of the continuation of a species. Number of people per unit area of land is called population density.