What are the Tajweed rules? The rules of tajweed are classified as follows: I. Noon and Meem Mushaddad is that noon or meem which has a shaddah with Ghunnah of 2 beats. II. Al –Qalqalah is vibration the sound at the end of the pronunciation of any letter of Qaaf, Ttaa, Baa, Jiim or Daal, when it is Saakin; with sukoon or shaddah.