What is this screw head? T15 is too small and T20 is too big. It has more wings than six so maybe it's not Torx at all?

It is screwed into a fascia board. A close-up of a metal screw head in a roof trim, with an unusual star-shaped pattern, possibly not Torx as it has more than six points.
 
There's also T17, could be something?
 
It has 8 odd and a torx 6...
Try a 4-square bit.
Probably something made up by some sheet metal manufacturer.
 
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egge80
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Double-square, is designed for fyrkantbit (Robertson) and makes it easier to get a grip as there are 8 positions to get a grip.
 
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flygarkammen and 1 other
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