CQD
CQD or cqd can be
- Carbon quantum dot, a carbon nanoparticle which is less than 10 nm in size and have some form of surface passivation
- CQD (distress signal), one of the first distress signals that started being used in regard to radio signals
- Chuanqiandian Cluster Miao language (ISO 639-3: cqd), a Hmongic language spoken by the Hmong people
- Shahrekord Shahid Estaki International Airport (IATA: CQD), an airport in Shahrekord, Chaharmahal & Bakhtiari, Iran
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