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- QORC
- QOSRC
- QPF electron gun
- QPL
- QPR
- QPRS
- QPSK
- QQPSK
- QR
- QR method
- QR-decomposition
- QRC
- QRCS
- QRG
- QRP
- QSAM
- QSO
- QST
- QT
- QT high-strength steel
- qt.
- QTAM
- Qty
- qtzn
- quad
- quad band canter
- quad flat pack
- quad imaging
- quad tree
- quad-polarized antenna
- quad-ridged horn
- quad-twin cable
- quadbit
- quadding of a cable
- quadflute
- quadflute corrugated board
- quadra potential focus electron gun
- quadra-potential focus
- quadrafilar helix antenna
- quadraloop antenna
