Qalqalah Kubra is a term in Arabic phonetics that refers to a specific type of sound produced when pronouncing certain letters. It applies to the letters ب (B), ج (J), د (D), ق (Q), and ط (T). When these letters appear with a vowel sound, they create a strong, echo-like effect, which is essential for proper pronunciation in the Arabic language. This phenomenon is particularly important in Tajweed, the art of reciting the Quran. Mastering Qalqalah Kubra helps ensure clarity and precision in recitation, allowing the reader to convey the intended meaning of the text effectively.