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Meanings and definitions for QSD

Q_code, "Is my keying defective?" / "Are my signals mutilated?"
Quality spread differential, a concept in finance
Quadrilateral Security Dialogue, a former multilateral dialogue platform (2007–08)
Quick Step–Davitamon, a former UCI World Tour cycling team (2003–04)
Syrian Democratic Forces (Quwwāt Sūriyā al-Dīmuqrāṭīya), an alliance of Kurdish, Arab and Assyrian militias in Northern Syria.