A continuum that is not decomposable is an indecomposable continuum.
Indecomposable Continuum
See also
Continuum, Decomposable Continuum, Hereditarily Decomposable ContinuumThis entry contributed by Matt Insall (author's link)
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Cite this as:
Weisstein, Eric W., with contributions by Matt Insall. "Indecomposable Continuum." From MathWorld--A Wolfram Resource. https://mathworld.wolfram.com/IndecomposableContinuum.html