QA        Quality Assurance
QAM       Quadrature Amplitude Modulation
QBE       Query By Example
QBF       Query by Form
QBIC      Query By Image Content [IBM]
QC        Quality Control
QDOS      Quick and Dirty Operating System
.QDI      Dictionary (file name extension) [Quicken]
.QDT      Data (file name extension) [Quicken]
QEMM      Quarterdeck Expanded Memory Manager [Quarterdeck Corp.]
QFA       Quick File Access
QFP       Quad Flat Pack
QIC       Quality Information Using Cycle Time [Hewlett-Packard] ,
          Quarter-Inch Cartridge
.QIF      Quicken Import File/Interchange Format (file name extension)
.QMT      Memorized List (file name extension) [Quicken]
.QNX      Indexes to Data (file name extension) [Quicken]
QPG       Quantum Phase Gate
QPSK      Quadrature Phase Shift Keying
QTC       Quicktime Conferencing [Macintosh]