Al-Lisan: The Nine Front-Teeth Letters of Tajweed

These nine letters are everywhere in Arabic. Taa and seen open countless verb forms; daal, dhal, and zay sit inside some of the most common words in the language; saad and taa-emphatic anchor two of the seven heavy letters. Treating them as nine separate, unrelated sounds makes them far harder to learn than they need to be — grouped correctly into three trios, the whole set becomes manageable in one sitting.

This lesson continues directly from the makhraj of laam, noon, and raa. With these nine letters, al-lisan — the largest of the five general zones — is complete. From here, the journey moves on to an entirely different zone: the makhraj of the lips.

By the end of this lesson, you will be able to sort all nine letters into their correct trio, identify the three that carry heaviness, and recognise a whistling quality that belongs to exactly three of these letters and no others in the alphabet.

Each of these nine letters is simply named after its own sound, with no independent meaning behind the names themselves. What matters far more than any individual name is the grouping: taa (ت), daal (د), and taa-emphatic (ط) form the first trio; thaa (ث), dhaal (ذ), and zha (ظ) form the second; seen (س), saad (ص), and zaay (ز) form the third.

Notice a pattern already visible in the names themselves: each trio contains an unvoiced "light" letter, a voiced "light" letter, and one heavier partner. This is not a coincidence — Arabic tajweed genuinely organises these nine letters by exactly this logic, and once you see the pattern, memorising which letter belongs where becomes far easier than treating all nine as a random list.

As always, read the sound, not the name — taa is read as a brief /t/, not the full syllable "taa," and the same applies to every letter in this lesson.

Each trio comes from its own precise point, moving from just behind the teeth to right at their edge.

Trio 1 — Against the Base of the Teeth

Taa, daal, and taa-emphatic are produced with the tip of the tongue against the base of the upper front incisors, where the teeth meet the gum. Contact is firm and complete — all three are stop consonants.

Trio 2 — Between the Teeth

Thaa, dhaal, and zha move slightly forward: the tip of the tongue rests lightly between the edges of the upper and lower front teeth, close to the English "th" position, and air flows continuously rather than stopping.

Trio 3 — Near the Edge of the Teeth

Seen, saad, and zaay come from the tip of the tongue held close to, but not touching, the edge of the lower front teeth, with the sides of the tongue narrowing the air into a thin channel — the physical basis of a whistling quality you will name in the next step.

Within each trio, the same internal logic repeats: one unvoiced light letter, one voiced light letter, and one heavier partner that changes the whole trio's character.

In Trio 1, taa is unvoiced and light, daal is voiced and light, and taa-emphatic is voiced and heavy — one of only seven heavy letters in Arabic. Daal and taa-emphatic are also two of the five qalqalah letters, so both bounce lightly when sakin, exactly as you saw with qaf and jeem in an earlier lesson.

In Trio 2, thaa is unvoiced and light, dhaal is voiced and light, and zha is voiced and heavy — the same letter you already met as daad's most notorious look-alike in an earlier lesson.

In Trio 3, seen is unvoiced and light, zaay is voiced and light, and saad is unvoiced and heavy. All three letters in this trio also share safeer (الصفير, "whistling"), a narrow, hissing quality produced by that thin air channel from Step 3 — a sifah found in no other Arabic letters at all.

Within Trio 1, taa and daal are separated only by voice — place two fingers on your throat and you will feel daal vibrate while taa does not. Taa-emphatic adds heaviness on top of daal's voicing, giving it a fuller, rounder quality that neither taa nor daal has.

Within Trio 2, thaa and dhaal map closely onto the English "th" sounds in "think" and "this" respectively, which makes them relatively easy for English speakers — the real challenge is zha, which you already met as daad's most confused partner in an earlier lesson. The fix there is unchanged: zha and daad share heaviness and voicing but come from completely different points in the mouth.

Within Trio 3, seen and zaay differ only by voice, the same pattern as taa and daal. Saad is the trickier one: it keeps seen's whistling safeer but adds heaviness, which can make it sound closer to seen than it should. Slow, exaggerated practice — holding saad's heaviness deliberately — is the most reliable fix. For the individual shape and full letter-by-letter treatment of seen and saad specifically, see our lessons on the letter seen and the letter saad.

Several of these letters share a base shape and are separated only by dots, a pattern worth learning as a set rather than letter by letter. Taa is a shallow curved shape with two dots above; thaa shares the exact same base shape with three dots above instead of two. Daal is a small hooked curve with no dot; dhaal shares that same hooked curve with one dot added above. Taa-emphatic is a rounded loop with a small vertical stroke rising from it, no dot; zha shares that same loop-and-stroke shape with one dot added above.

Seen is written as three small connected humps sitting on the line, with no dots; saad begins the same way but adds a distinctive looped tail that dips below the line. Zaay, meanwhile, shares its base shape with raa, covered in an earlier lesson — a short hook below the line — differing only by zaay's single dot above.

All nine letters connect normally to the letter before them; only zaay, following raa's pattern, never connects to the letter after it, always leaving a small gap.

All nine letters take fathah, kasrah, and dammah normally, with one rule to hold onto: the three heavy letters in this lesson — taa-emphatic, zha, and saad — keep their heaviness through every vowel, even kasrah, which usually lightens the sound of other letters. When sakin, daal and taa-emphatic bounce with qalqalah; the other seven are read as plain, held sounds.

Surah Al-Fatihah gives you a remarkably efficient practice phrase: الصِّرَاطَ الْمُسْتَقِيمَ (as-siraata al-mustaqeem, "the straight path," 1:6) contains saad, taa-emphatic, seen, and taa all in five words. الدِّينِ (ad-deen, "the [Day of] Judgement," 1:4) carries daal, and الَّذِينَ (alladheena, "those who," 1:7) carries dhaal.

For thaa, turn to Surah Al-Falaq: النَّفَّاثَاتِ (an-naffathat, "the blowers [of malicious whispers]," 113:4). Zaay appears throughout everyday vocabulary — رِزْق (rizq, "provision" or "sustenance") is one of the most common words built on this letter.

Practise recognition one trio at a time rather than all nine letters at once. Start with Trio 1: say taa, daal, and taa-emphatic back to back, feeling the voice switch on at daal and the heaviness switch on at taa-emphatic. Move to Trio 2 the same way, then Trio 3, paying special attention to the whistling quality that seen, saad, and zaay share and nothing else in the alphabet does.

For listening, the most useful drill is within-trio comparison rather than across trios — the differences between taa and daal are far more instructive to your ear right now than the difference between taa and thaa. A simple memory aid: each trio is "light, light-plus-voice, light-plus-voice-plus-weight" — the pattern repeats three times.

Quick review: three trios, nine letters, three heavy letters (taa-emphatic, zha, saad), two qalqalah letters (daal, taa-emphatic), and one unique quality — safeer — shared by exactly three letters. Al-lisan is now complete. The fastest way to know you are placing all nine correctly is to have a trained ear check you directly. Book a free evaluation and a Waraqa teacher will work through all three trios with you, one at a time.