It’s a back-to-front SMA like those used in Wifi. They are advertised as RP-SMA for reverse polarity. They really should be called hermaphrodite-SMA because what looks like a female component has male centre pieces and female outers and the male nut-like component has female centre pieces and male outers. They were designed so that people couldn’t simply use existing microwave cables/antennas with Wifi and use illegal amplifiers and antennas with the type-approved unlicensed Wifi gear.
Of course what normally happens is you have both Wifi and normal patch leads laying about and you decide to play about with the house Wifi and you pick up any random lead then spend 5 minutes with your hand up the back of a shelf like some DIY obstetrician trying to get the damn SMA patch lead to screw on to the router. That’s when you realise you are trying to mix RP-SMA and SMA.