Android notification icons

A new notification icon appeared in the upper right corner. It is immediately to the left of the WiFi signal strength icon. It is a black square with what you might call a capital N in white. Both vertical parts of the N has its own diagonal line [best description I can give]. If I pull down the notification area and expand it to full screen the icon is not displayed so there is no explanation of what the icon represents. I searched online through Android notification icons and can’t find an explanation.

I believe that is the NFC activated icon. Does it look like this but not in blue?

That’s it. Thank you.

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