Final answer:
The pyramid that shows relationships among levels in an ecological context is called the ecological pyramid. It illustrates trophic levels based on organism numbers, biomass, or energy content in an ecosystem.
Step-by-step explanation:
The pyramid that shows relationships among levels, particularly in an ecological context, is known as the ecological pyramid (also referred to as an Eltonian pyramid). This graphical representation illustrates the different trophic levels within an ecosystem, and it can be based on organism numbers, biomass, or energy content. The ecological pyramid provides insight into the ecosystem's dynamics, including the study of changes in ecosystem structure caused by environmental changes or internal forces. It helps us understand how energy and biomass decrease from one trophic level to the next in the ecosystem, which is a community of living organisms interacting with their abiotic environment.