Rawm means pronouncing a very faint trace of the final vowel; the source describes a vowel uttered in a subdued voice.
It is discussed for eligible original kasrah and ḍammah endings, not for an original fatḥah. In a kasrah-ending such as «ذُو انْتِقَامٍ», a teacher can demonstrate how rawm differs from full sukūn.
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Rawm: a trace of the vowel
Rules of Waqf — Correct Stopping, Resumption, Rawm, Ishmām and Qurʾānic Orthography
Rawm means pronouncing a very faint trace of the final vowel; the source describes a vowel uttered in a subdued voice.
It is discussed for eligible original kasrah and ḍammah endings, not for an original fatḥah. In a kasrah-ending such as «ذُو انْتِقَامٍ», a teacher can demonstrate how rawm differs from full sukūn.