Which bit for this screw head?

[Annahallberg]

About to loosen a post that's screwed with a screw I don't recognize. I don't have a bit that fits.
Does anyone know what kind of screw head this is?

 

[term]

Knock it off with a chisel instead.

 

[Fotografen]

Sweet world... why come up with such a skruvskalle?? Remove/drill it out and put in a proper screw...

 

[term]

Sweet world...why come up with such a screwhead?? Knock it off/drill it out and put in a real screw...

Theft protection!

 

[Herr_Per]

Lox is the fitting name for the bits marketed by Grabber.

 

[fahlis]

Torq-set maybe?

 

[JanneJanne123]

PH2 can thus work according to the product sheet from Grabber.