Sefer Binsoa - all about the inverted letters nun.

Aside from their familiar use in the service at the opening and closing of the ark, the two p’sukim (verses) from the sedra B’ha’alot’cha  (lit. in your going up) are unique for, in the majority of Torah
 scrolls and biblical manuscripts, Bamidbar l0:35-36 is encased between two critical marks, each taking the form of an inverted nun and called in Hebrew nun m’nuzeret  (isolated nun) or nun hafucha (inverted
nun), almost as if they are in some sort of  parenthesis. Which they are! There is a lot of disagreement about exactly what they mean and how they should be written. Also a lot of rabbinical commentary on the importance of these two verses considered a book all by themselves. Far too much for a single web page - so I have written a whole book on the subject. SEFER BINSOA is available in both paperback and PDF through lulu.com.

To buy a copy ...

A short excerpt from the introduction and the first chapter is also available on Academia.