If this letter appears clearly in the dream, then it symbolizes the moon. Therefore it refers to all matters of creativity and fantasy.
Dream dictionary: n.n.c. dream meanings
Remarking what was said with letter N, N letter in dream can be interpreted as the crowning of success, after many problems or many ups and downs that you had.
If this letter clearly appears in your dream it means that there will be success and failures that you will finally overcome if you keep up your courage and tenacity.