In the Masoretic text of Tehillim 107 there are 7 pesukim which contain an inverted letter nun (similar to those in Sefer Bamidbar). In my standard edition Mikraot Gedolot none of the commentaries explain this. A Google search yielded only this podcast (which I have not been able to listen to yet). Therefore I would like to know what the purpose of these letters are.
There are markers in this chapter ... and they come to be expounded upon instead of “buts” and “onlys” to limit [the power of the verse] meaning that if they [the prisoners] cry out before the verdict has been promulgated, they are answered; after the verdict has been promulgated, they are not answered.