What does this icon (screenshot) in status bar mean?

Question

(First, yes, I did RTFM and so my homework is done.)

My phone shows this icon.

I looked into the manual of my phone, it lists about 20 status bar icons, but this one isn't among them.

— deLock | Sources

Answer

I found out that the icon represents enabled 'Data Saver', which should also prevent background data transfers.

— deLock | Sources

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