Board Thread:Speculation House/@comment-14138255-20151206164217/@comment-107.207.179.69-20151206173027

Pennys robot designation is the M374 aka META.

Cinder was looking at a robot with that label and below that was the name PENNY!

Link:http://img03.deviantart.net/8247/i/2015/340/e/9/rwby_penny_is_meta_by_dustiniz117-d9j897j.png