4o

[-JKP-]

I was looking at an old book called You are not allowed to view links. Register or Login to view., it being an old guide to reading medieval writing styles and abbreviations. 

Something I noticed on You are not allowed to view links. Register or Login to view., is that the way they're writing P looks a lot like voynich 4o.

But this got me thinking -- might it be that 4 and o are always together because it's actually one letter? Are there any examples where 4 is not followed by o?

Yes, there are a few places where the o does not follow the 4.

You are correct in that some scripts from the 14th and 15th century are written with the p not fully connected and resembles a 4. There are also some where where the cross bars of plus signs loop up for ease of writing and also somewhat resemble a 4.