It looks to me like a pre-fabricated bastion dropped into a war-zone to help in the pacification process. A gun-turret at the end of each arm, and a communication node in the middle (maybe a door somewhere? I dunno) and you're sorted I reckon.
That's my first thought anyway.
Second thought is that it's the engine housing for a spaceship. Not a huge one, I'm thinking about a metre long I guess. Three pointy bits coming up from the ends and the main body coming up from the centre is what I've got in mind obviously.