Macrocosm
Etymology
From Greek "makros" (large, long) and "kosmos" (world, order). It arose in ancient and medieval thought paired with "microcosm," the idea that a human being (the small world) reflects the structure of the universe (the great one).
noun · /MAK-roh-koz-um/
The whole of a complex structure — the universe or the wider world — seen as a single great system.
What it names
Zooming out to the grand scale, especially when a small part mirrors the vast whole.
Example
The tide pool was a macrocosm in miniature — every predator, prey, and truce of the wider sea.
Related idea
Macrocosm is the great whole; microcosm is the small world that mirrors it — a household standing in for a nation, say.