Logically, you're expecting me not to know, so I guess it's something from your world. 'Maneuver' implies it's for some form of motion, most likely to aid you in your war against your titans to make you more agile. The '3D' says it permits three-dimensional motion, or traversing along the X-Y-Z axes. No doubt this is due to titans being more or less gigas; that is, standing at impeccable heights and require swift movement up and down.

However, it can't solely be for movement; you have to have some form of weapon on you for confrontation. Swords maybe for more accuracy. I can't imagine bullets working well against titans. And since all Weapons here have never been in separate pieces, it's all bound together. What it may look like on the other hand, I can only speculate.

So, what did I miss?