At my 38 wk appointment the midwife said baby wasn't engaged still and probably because it was posterior

Anyway, when I was looking in my orange book to see what they wrote it was different to the other times. In the column about engagement they usually write 'NE' which I assume means not engaged. This time it has an arrow pointing up and then '5/5' written next to it. What on earth does that mean? Why didn't they just write NE??

Anyone know??
Thanks