Rawm leaves a slight audible trace of the final vowel: neither a full vowel nor full silence. Ishmām indicates a final ḍammah through the lips without voicing a complete ḍammah.
They are distinct stopping techniques. The book includes them in its option counts; their actual performance requires hearing and guided practice, not spelling alone.
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Rawm and ishmām are not the same
Madd Lengths and Permissible Combinations — Ṭūl, Tawassuṭ, Qaṣr and Consistency
Rawm leaves a slight audible trace of the final vowel: neither a full vowel nor full silence. Ishmām indicates a final ḍammah through the lips without voicing a complete ḍammah.
They are distinct stopping techniques. The book includes them in its option counts; their actual performance requires hearing and guided practice, not spelling alone.