Wiktionary
microworld
n. The world as it exists at a microscopic scale, subject to quantum effects etc. (from 20th c.)
Usage examples of "microworld".
At best there are only hints from experimental results that the microworld incorporates this symmetry, but, for reasons discussed earlier, there is a strong belief that it does.
The reason is that particle accelerators probe the microworld by utilizing the strong, weak, and electromagnetic forces.