QAM Quadrature Amplitude Modulation
QC Quality Control
QC Queen's Counsel 
QD Quaque Die (diariamente) (Medicina)
QDA Quantity Discount Agreement
QED Quod Erat Demonstrandum (ser demonstrado)) [Latin]
QEF Quod Erat Faciendum (ser feito) [Latin]
QEI Quod Erat Inveniendum (ser encontado) [Latin]
QET Quantum Effect Transistor
QIC Quarter-Inch Cartridge
QID Quater In Die (quatro horas por dia) (Medicina)
QLI Query Language Interpreter
QM QuarterMaster
QMC QuarterMaster Corps
QMF Query Management Facility
QMG QuarterMaster General
QMS Quality Micro Systems (nome de companhia)
QNS Quantity Not Sufficient
QSO Quasi-Stellar Object (Espacial)
q.v. ???? (Latin(?):que vê)
QWERTY first six keys from left on top alphabetic row of standard keyboard
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