The Four Rules of Noon Sakinah and Tanween

If a student learns only one set of Tajweed rules properly, this is the set. The rules of noon sakinah and tanween govern more occurrences in the Qur’an than almost any other topic, and they are usually taught early precisely because they come up constantly.

What the Rule Applies To

A noon sakinah is the letter ن carrying a sukoon — no vowel of its own. Tanween is the doubled vowel mark at the end of a word, which produces the same n sound. The two behave identically, so one set of rules covers both.

What happens to that n sound depends entirely on the letter that follows it. There are four possibilities, and every letter of the alphabet falls into exactly one of them.

1. Izhar — Say It Clearly

When a noon sakinah or tanween is followed by one of the six throat letters — ء, ه, ع, ح, غ, خ — the noon is pronounced plainly, with no merging and no nasalisation.

The logic is worth knowing rather than memorising: the throat letters are articulated far from the noon, so there is nothing for the sound to blend into. Clear pronunciation is simply what the mouth does naturally.

2. Idgham — Merge It

Before six letters — ي, ر, م, ل, و, ن, remembered by the mnemonic yarmaloon — the noon merges into the following letter.

This group splits in two, and the split is where students slip. With ي, ن, م, و the merge carries ghunnah — a nasal hum held for roughly two counts. With ل and ر the merge is complete and there is no ghunnah at all. Students who apply ghunnah to all six are making one of the most common errors in recitation.

3. Iqlab — Convert It

One letter, one rule. Before ب, the noon sound converts to a m sound, held with ghunnah. In most printed mushafs a small م is placed above the noon to mark it, so this is the easiest of the four to spot on the page.

4. Ikhfa — Hide It

The remaining fifteen letters take ikhfa: the noon is neither pronounced clearly nor fully merged, but held somewhere between the two, with ghunnah, while the mouth prepares for the coming letter.

Ikhfa is the largest group and the hardest to self-check, because “partly hidden” is not something a description can pin down. It has to be heard from a teacher and imitated. Students working alone almost always drift toward one extreme — either pronouncing the noon fully or dropping it entirely.

Learning Them in the Right Order

Do not attempt to memorise four letter-lists at once. The workable order is to learn izhar first, since six letters is manageable and the sound is unchanged, then iqlab because it is a single letter, then idgham with its two sub-cases, and finally ikhfa — which is easiest defined as everything left over.

Then apply them to a short surah you already know by heart, slowly, marking each occurrence. Recognition in real text is the skill; reciting the lists is not. For the wider picture, see what Tajweed covers and why it matters and our Tajweed & Maqamat program.