Identify Nikon D70 viewfinder symbol please?

I'm a Canon shooter but a Nikon D70 owner asked me yesterday what a certain symbol meant in his viewfinder. It was bellow left of the image and basically looked like
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Any ideas?

Added (1). Jens, the screen I saw did not look like that. Maybe it wasn't a D70. I'll have to ask.

That symbol shows the selected AF point and perhaps also the metering mode.