What are the letters for ghunnah?

The letters for ghunnah, which refers to a nasal sound in Arabic phonetics, are ن (noon) and م (meem). When these letters appear in specific contexts, such as in certain Words or when they are followed by certain other letters, they produce the nasal sound characteristic of ghunnah. This sound is an important aspect of proper pronunciation in Tajweed, the art of reciting the Quran.