What does 'CShell' mean for Windows Mobile?

[Windows Central]

What does it all really mean, anyway?
A couple of weeks ago, we posted exclusive images of Microsoft's new "composable shell," a.k.a., "CShell," for Windows 10 Mobile.
What exactly is Cshell? It's not a something you find on the beach, that's for sure. From Windows Central Senior Editor Zac Bowden:

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