Is there an approved way / convention for displaying a "wait...." indicator?

By which I mean, like a “loading” indicator on the Web - a spinner, say - to indicate a slow operation in progress (but not using a progress bar, because the progress might not be a computable value)

I’m not sure (or aware of) of any conventions, but this is an example of how you could do it.
I’m new to Textual, so I’m probably going to get a lot of weird looks from the maintainers, but couldn’t find an alternative anywhere :man_shrugging:t5:

Thanks for the example!

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