Among the most important chapters in Tajweed is the study of Noon Sakinah (a non-voweled resting Noon, نْ) and Tanween (double vowel marks: ً ٍ ٌ). Because the Arabic language naturally tends toward ease and phonetic harmony, how this sound is articulated depends entirely on the letter that immediately follows it.
{{AYAH:112:4}} [Placeholder: Surah Al-Ikhlas, Ayah 4 — example containing Noon Sakinah followed by letter Kaaf]
Whenever a Noon Sakinah or Tanween appears, it must be recited according to one of four established rules:
1. Izhar Halqi (Clear Throat Pronunciation)
- Linguistic meaning: Clarification or manifestation.
- The Letters (6): The throat letters: Hamzah (ء), Haa (هـ), ’Ayn (ع), Haa (ح), Ghayn (غ), Khaa (خ).
- How to recite: Articulate the Noon sound distinctly from the tip of the tongue without nasal lingering (Ghunnah) or pausing.
2. Idgham (Merging or Blending)
- Linguistic meaning: Inserting one thing into another.
- The Letters (6): Combined in the mnemonic word Y-R-M-L-W-N (يرملون): Yaa (ي), Raa (ر), Meem (م), Laam (ل), Waw (و), Noon (ن).
- Two Categories:
- Idgham with Ghunnah (بِغُنَّة): When followed by Yaa, Noon, Meem, or Waw (يَنْمُو). The two letters merge into a doubled sound accompanied by a resonant 2-count nasal echo from the nasal cavity.
- Idgham without Ghunnah (بِغَيْرِ غُنَّة): When followed by Laam (ل) or Raa (ر). The Noon merges completely into the following letter without any nasal sound.
3. Iqlab (Conversion or Transformation)
- Linguistic meaning: Turning or inverting something.
- The Letter (1): Exclusively the letter Baa (ب).
- How to recite: The Noon or Tanween transforms phonetically into an unvoiced Meem (م). The reciter touches the lips lightly without heavy pressing, holding a subtle 2-count nasal Ghunnah. In the printed Mus’haf, this rule is indicated by a tiny superscript Meem symbol above the text.
4. Ikhfa Haqiqi (Concealment)
- Linguistic meaning: Hiding or veiling.
- The Letters (15): All remaining Arabic letters not covered above (Taa, Thaa, Jeem, Daal, Dhaal, Zay, Seen, Sheen, Saad, Dhad, Taw, Dhaw, Faa, Qaaf, Kaaf).
- How to recite: Prepare the mouth in the position of the following letter while emitting a veiled nasal Ghunnah for 2 counts. If the following letter is heavy (Musta’liyah like Saad or Qaaf), the Ikhfa sound is pronounced heavy; if light, the Ikhfa is pronounced light.
{{AYAH:2:2}} [Placeholder: Surah Al-Baqarah, Ayah 2 — example of Ikhfa Haqiqi in the phrase hudan-lilmuttaqeen]
How to Master These Rules in Daily Recitation
Memorizing the rule definitions is only the first step. True proficiency comes from listening to an experienced teacher who can correct tiny mistakes in nasalization timing or tongue pressure.
For an exhaustive overview of all recitation sciences, read our master Tajweed Rules Explained pillar guide, or study with our verified instructors in our Online Tajweed Course. Book a free assessment today through our Free Trial Class.
Frequently Asked Questions
What is the difference between Noon Sakinah and Tanween?
What are the 6 letters of Izhar Halqi?
What are the two types of Idgham?
How long should the Ghunnah sound last during Ikhfa?
Reviewed by Sheikh Ahmad Huzaifi
Lead Faculty & Academic Director (PhD Islamic Studies)
Every guide published on Quran Classes Academy is vetted for scriptural integrity, authentic Tajweed methodology, and sound educational pacing. Written by Sheikh Ahmad Huzaifi on October 7, 2026.
Put These Principles Into Practice with a Qualified Teacher
Experience personalized one-to-one recitation assessment with certified male or female tutors. No commitment required.
Explore the Full Learning Path
Tajweed Rules Explained: The Complete Guide
This article is part of our comprehensive foundational pillar on tajweed rules explained.
Online Tajweed Course
Learn this subject 1-on-1 with certified instructors tailored to your schedule.