Nun represents an alveolar nasal, (IPA: /n/), like the English letter N. Variations. Nun, like Kaph, Mem, Pe, and Tzadi, has a final form, used at the end of words. Its shape changes from נ to ן. There are also nine instances of an inverted nun (׆) in the Tanakh. Significance. In gematria, Nun represents the number 50. This letter also has two different forms – the regular letter נ and the special final letter ן. The letter nun represents giving. If we look at the word נָתַן (natan) gave, we see that it starts and ends with the letter נ. This teaches us the reciprocal nature of giving. When one gives to another person, it comes back to him/her in some way. The person who has the letter nun in their name is someone who takes charge of his/her life and does not let things that happen get him or her down. The willpower that is expressed in this letter, is something that changes from person to person, and can also change at different times. In fact, our actions can change the situation that we are in.
It reads in Psalm 119:105-112 Niv.
נ Nun
Your word is a lamp for my feet, a light on my path. I have taken an oath and confirmed it, that I will follow your righteous laws. I have suffered much; preserve my life, Lord, according to your word. Accept, Lord, the willing praise of my mouth, and teach me your laws. Though I constantly take my life in my hands, I will not forget your law. The wicked have set a snare for me, but I have not strayed from your precepts. Your statutes are my heritage forever; they are the joy of my heart. My heart is set on keeping your decrees to the very end.