Tanwīn is the double-vowel sign (ــً، ــٍ، ــٌ) that adds a final n-sound during connected recitation, although a separate written ن is normally absent. In عَذَابٌ أَلِيمٌ, a hamzah follows the tanwīn.
That shared n-sound explains why the author studies tanwīn and sākin nūn together. The rules of stopping on tanwīn are a separate matter; these examples assume continued reading.
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Recognizing tanwīn
Sākin Nūn & Tanwīn — Iẓhār, Idghām, Qalb and Ikhfāʾ
Tanwīn is the double-vowel sign (ــً، ــٍ، ــٌ) that adds a final n-sound during connected recitation, although a separate written ن is normally absent. In عَذَابٌ أَلِيمٌ, a hamzah follows the tanwīn.
That shared n-sound explains why the author studies tanwīn and sākin nūn together. The rules of stopping on tanwīn are a separate matter; these examples assume continued reading.