¿?

OK, I'm confused. I pass this little sign almost every day. It's posted on a door near the entrance to the women's locker room at the ARC. I know I'm in graduate school and yes, one of the themes I work with is gender, its delineations and the blurring of those lines. I also consider myself transgender-friendly. But...maybe I need to make some actual trans-gendered friends that I can ask, because despite all of the above I can't figure this out...



I'm only sort of trying to be funny...I mean I guess I can sort of figure out one type of trans-gendered person who might need the room. Also, the / could mean that either lactating people or trans-gendered persons can use the room...I'm open to being educated.
P.S. This was the first photo I sent from my camera to my computer! I just figured it out 20 minutes before posting this!