"Only witches and wizards will be able to see this post," writes Mid Yorkshire Hospitals NHS Trust in a post on facebook.<br /><br />"The Children’s Assessment Unit (CAU) at Pinderfields Hospital didn’t previously have a ward number, or so we thought... It turns out only little witches and wizards can see the new sign that displays the wards number; 9 3/4.<br /><br />"Non-magic folk will just have to take our word for it that this is a picture of the new sign.<br /><br />Please note: we have been informed that there is no portal to the wizarding world via the CAU so please, if you are magical, don’t run at our wall."