Noon Sakinah rules determine how a Noon with no vowel of its own (نْ) or a Tanween is pronounced, depending on the letter that follows it. There are four rules: Izhar (clear pronunciation, 6 letters), Idgham (merging, 6 letters), Iqlab (conversion to Meem, 1 letter), and Ikhfa (concealment, 15 letters). Every one of the 28 Arabic letters belongs to exactly one of these four groups, so in connected recitation the letter after the Noon tells you the usual rule — subject to a few conditions and transmitted exceptions explained below.

What Is Noon Sakinah?

A Noon Sakinah (النون الساكنة) is the letter ن carrying a sukoon — a Noon with no vowel of its own. It appears in the middle of a word and at the end of one, and it turns up in every part of speech: in nouns (أَنْعَام), in verbs (يَنْصُر) and in particles (مِنْ, عَنْ).

The rules on this page apply to that unvowelled Noon only. A Noon carrying a fatḥah, ḍammah or kasrah — نَ نُ نِ — is simply pronounced as it is written, and none of the four rulings touch it. Students who mix the two end up applying Ikhfa in places it does not belong, so it is worth fixing the boundary early: a Noon with a vowel takes none of these rules. (One thing to know when reading the Madinah Muṣḥaf: the sukoon sign is usually left off a Noon that is hidden or merged, as in مِّن سِجِّيلٍ — but that Noon still has no vowel.)

One more property makes the Noon Sakinah the easier half of this topic: it is fixed. It is written in the muṣḥaf, it keeps its sukoon whether you continue or pause, and it does not appear or disappear depending on how you read the sentence. What you see on the page is what your tongue has to deal with.

What Is Tanween and Why Does It Follow the Same Rules?

Tanween (التنوين) is an additional Noon Sakinah sound pronounced at the end of a noun in connected recitation. It is shown by doubled vowel marks — ــًـ ــٌـ ــٍـ — rather than by a separately written Noon. The Noon is heard but not written, which is exactly why beginners treat Tanween as a separate topic when it is not one.

The golden rule is short: any ruling that applies to a written Noon Sakinah applies identically to Tanween. Same four rules, same letter groups, same ghunnah length. There is nothing extra to memorise.

One important practical difference is position. A Noon Sakinah can sit inside a word, so the letter after it may belong to the same word. Tanween is always word-final, so the letter that triggers the rule is always the first letter of the next word — which is why Tanween examples always straddle a word boundary. It also means Tanween’s Noon sound belongs to connected recitation: when you stop on the word, separate stopping rules apply and the Noon is not pronounced (a fatḥah Tanween becomes a long ā, so عَلِيمًا is stopped as ʿalīmā).

Read the two columns across and the parallel is unmistakable. If you can classify the left column, you can already classify the right one — the only new skill is hearing the Noon that isn’t printed.

The 4 Noon Sakinah Rules at a Glance

Most guides present the four Noon Sakinah rules as four unrelated lists to be memorised. They are not unrelated — each group has a phonetic reason behind it, and once you see the reasons the lists become far easier to hold.

The Noon is produced at the tip of the tongue, with the sound resonating in the nose. Two things shape the four rules: where the following letter is made relative to the Noon, and which qualities it shares with the Noon — which is why this topic sits so close to the Makhraj of Arabic letters .

That is the core logic in four sentences. The letter lists that follow are consequences of it, not arbitrary groupings, and students who understand the logic stop confusing Ikhfa with Idgham much sooner.

One detail to carry into the sections below: the ghunnah — the nasal hum — is measured in counts, not moments. Two counts (ḥarakatān), roughly the length of saying two short vowels. It is held for two counts in Ikhfa, in Iqlab and in Idgham with ي ن م و; there is no added or prolonged ghunnah in Izhar, or in Idgham with ل ر. Getting the letter groups right but the ghunnah length wrong is one of the commonest ways to sound untrained while technically applying the correct rule.

Izhar — The 6 Clear Letters

Izhar (إظهار) means “to make clear”. The Noon Sakinah or Tanween is pronounced exactly as it is — a clean Noon, released fully, with no added or prolonged ghunnah and no blending into the letter that follows.

These six are not a random selection: they are the ḥurūf al-ḥalq, the throat letters, and they are the complete set of them. The Noon is made at the front of the mouth; these are made at the very back. The distance is too great for any blending to occur naturally, so the language leaves the Noon alone. Learn the six as “the throat group” and you will never need to recite the list.

Idgham — The 6 Merging Letters

Idgham (إدغام) means “to merge”. Instead of being pronounced as a separate Noon, the Noon Sakinah or Tanween is carried into the letter that follows — and for Idgham the two must sit in two separate words. How completely the Noon merges depends on the letter:

The six Idgham letters are ي ر م ل و ن, traditionally gathered in the phrase يَرْمَلُونَ (yarmalūn). For the ghunnah they split into two groups, and that split matters more than the list.

Idgham with Ghunnah (4 letters: ي ن م و)

These four are gathered in the word يَنْمُو (yanmū, “it grows”) — a mnemonic worth ten minutes of your time, because it is the only list on this page you truly have to hold. Before all four the nasal sound is held for two counts: as a complete merge into ن and م, and as the Noon’s own remaining ghunnah before ي and و.

Idgham without Ghunnah (2 letters: ل ر)

With Lām and Rā the merge is total and instant: the Noon turns into the next letter and no nasal sound is left behind at all. This is the group learners over-hum most, because they carry the ghunnah habit across from the four letters above.

The Exception — When Idgham Doesn’t Apply

Idgham requires the Noon Sakinah and the following letter to sit in two separate words. When a Noon Sakinah is followed by و or ي inside the same word, there is no merging at all — the Noon is pronounced clearly. Scholars call this al-iẓhār al-muṭlaq, absolute clarity, and it is the reason a reader who has memorised the yarmalūn list can still get these words wrong.

Four words is a small thing to learn, and ٱلدُّنْيَا occurs frequently in the Quran — so this exception is not academic trivia. It is a correction most readers need early on.

Iqlab — The 1 Converting Letter

Iqlab (إقلاب) means “to convert”. It has a single trigger letter — ب — and one instruction: when a Noon Sakinah or Tanween is followed by Bā, the Noon is turned into a hidden Meem, pronounced with the lips lightly together and a ghunnah held for two counts.

The reason is phonetic. The Bā is made at the lips; the Noon is made with the tip of the tongue and the nose open. A clear Noon followed straight by a closed-lip Bā is awkward, and the two are too far apart to merge. So Arabic uses the sound that bridges them: the Meem, which shares the Bā’s articulation point (the lips) and the Noon’s nasality (the ghunnah). Nothing is invented — the Meem is simply the natural meeting point of the two.

A note on 96:15: the ending of لَنَسْفَعًۢا looks like a Tanween, but it is not one. It is the light Noon of Emphasis (nūn al-tawkīd al-khafīfah) attached to a verb — and Tanween only ever attaches to nouns. It still behaves like a Noon Sakinah, so it takes Iqlab before ب when you continue reading; if you stop on the word, it is read with a long ā.

The small meem you keep seeing in the muṣḥaf

Iqlab is the only one of the four rules with its own dedicated symbol. Wherever it occurs, a small meem is written above the Noon or in place of one of the Tanween strokes — نۢ, ـًۢ. Readers see it constantly and rarely know what it means. It is not a vowel and not part of the spelling: it is an instruction to the reciter, telling you to produce a Meem here rather than a Noon. (The other rules are signalled more quietly — by whether the Noon carries a sukoon and whether the next letter carries a shaddah.)

One nuance worth carrying: the lips should meet lightly. Pressing them shut turns the hidden Meem into a full, released Meem and cuts the ghunnah short. The target is a soft closure held for two counts, with the sound running through the nose the whole time.

Ikhfa — The 15 Hidden Letters

The Ikhfa rules cover more letters than the other three combined, which makes this the rule you will apply most often on any given page. Ikhfa (إخفاء) means “to conceal”: the Noon is pronounced neither clearly nor merged away, but held in a middle state — hidden behind a nasal hum lasting two counts.

The practical description is more useful than the definition. In Ikhfa your tongue does not press onto the Noon’s articulation point. It stays slightly away from it and moves towards the position of the letter that is coming, while the sound continues through the nose during the gap. That gap is the Ikhfa.

Some of the fifteen carry a sound of their own that changes the ghunnah: the ghunnah is slightly heavier before heavy letters in Arabic like ق and ط, and stays thin before light ones like ت and ك. It is a small adjustment, but it is what makes an Ikhfa sound native rather than mechanical.

The three degrees of Ikhfa

Not every Ikhfa sounds identical, and this is the layer most guides leave out. How close the concealment sits to Idgham or to Izhar depends on how near the following letter’s articulation point is to the Noon’s.

You do not need to reproduce the three degrees deliberately; they emerge on their own once the tongue is genuinely moving towards the next letter instead of stopping at the Noon. The ghunnah itself stays two counts at every degree — what changes is how close the tongue comes to the Noon’s position. Knowing this explains why your Ikhfa before ق sounds different from your Ikhfa before ت — and reassures you that the difference is correct, not a fault. The same three-way gradation is set out in the classical Tajweed manuals, where it is tied directly to the articulation points rather than to convention.

Test Yourself: Which Noon Sakinah Rule Applies?

Four rules, twenty-eight letters — the only way to know if it’s stuck is to test it. We’ll show you a word from the Quran with the Noon Sakinah highlighted in gold and the letter after it underlined. You pick the rule. Twelve questions, instant feedback, no sign-up.

Play: The Eagle of Izhar

The quiz checks whether you know the rule. This one checks whether you can spot the letters at speed — a different skill, and the one that actually shows up when you are reciting a page rather than studying a chart. Play it directly below, or open it in a new tab if you prefer a full screen.

On a phone, the full-screen version is the most comfortable way to play — the game is controlled by touch and drag, which works best when it fills the screen.

It works well for children too. The six throat letters stop being a list to recite and become a group they can recognise on sight — which is exactly the transfer you want in place before formal Tajweed lessons begin.

Noon Sakinah and Tanween Examples from the Quran

Rules settle once you meet them in the text you actually recite. Each line highlights the Noon or Tanween in its rule’s colour — Izhar, Idgham, Iqlab, Ikhfa — names the rule in the note beside it, and gives the recitation of Sheikh Al-Husary.

Notice how often two different rules land in the same short verse — 106:4 alone carries an Ikhfa and an Izhar four words apart. That is the real skill: not producing each sound in isolation, but switching between them cleanly at reciting speed. If you’d like to drill this alongside the other rules, our free Arabic letter games cover the same ground for children and adults.

Common Mistakes to Avoid

Frequently Asked Questions

Where This Fits in Tajweed

The Noon Sakinah rules are the first system most students meet inside the wider body of Tajweed rules, and they are a good place to start precisely because they are so complete: four rules, twenty-eight letters, and only a handful of fixed exceptions. Once the chart is in your head, almost every Noon on the page has an answer.

What takes longer is the sound. Classifying a letter is a five-second decision; holding a ghunnah for a genuine two counts, in the middle of a verse, at reciting speed, is a physical habit. If you want that feedback, our Tajweed courses are built around exactly this kind of correction, or you can simply book a free trial lesson and recite a page.

May Allah make the Quran the spring of your heart, and may He accept it from you. 🤲