All three—ط، د، ت—share shiddah, a firm closure. But ṭāʾ combines jahr, raised tongue and iṭbāq; dāl is voiced but low and open; tāʾ is breathy, low and open.
Read طَ، دَ، تَ without confusing them. A common property (complete closure) never cancels other properties that define separate letters.
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Ṭāʾ, dāl and tāʾ: shared closure, different character
Letter-by-Letter Qualities and Distinguishing Features
All three—ط، د، ت—share shiddah, a firm closure. But ṭāʾ combines jahr, raised tongue and iṭbāq; dāl is voiced but low and open; tāʾ is breathy, low and open.
Read طَ، دَ، تَ without confusing them. A common property (complete closure) never cancels other properties that define separate letters.