what the name of this connector?

what the name of this connector?
 

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If I were feeling waggish, I'd say George. Seriously, it might be a version of a DIN connector. It's kinda weird that the key is near the center of the pin instead of being on the edge.
Hi wrenchone,

I don't think any of the sockets are keys. I f you look closely, there appears to be a flat at the 12 O'clock position. I think that is your key.
On the other hand, I don't think you need a key at all because you can't plug it incorrectly to begin with.

Sincerely,

Ralf