What is the Derby number for Iron Maven? Is it 13 o 36?

I keep hearing 13 o 36 and would really Amore to know the answer. Maybe someone can mostra me a picture of Iron Maven with her back turned to the camera (because the one where she is shaking hands with Bliss doesn't cut it because her hair is covering the text on her shirt) o a close-up of what is written on her necklace?