Googling around, I found a good big picture of a
Twinax
female->female connector:
And a decent picture of the associated male Twinax
terminator:
Those are actually pages that contain the pictures. The pictures
themselves, for anyone who wants just them, turn out to be at
http://www.connectworld.net/iecnet/images/jpeg/L0209.jpg and
.../jpeg/TWINAXF-F.jpg.
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