WPreservation of magnetic audiotape
WAzimuth compass
WBiconic cusp
WCompass
WDisk read-and-write head
WFaraday balance
WGouy balance
WHalbach array
WHall-effect sensor
WHelmholtz coil
WLevitron
WLuopan
WMagnetic developer
WMagnetic field viewing film
WMagnetic gear
WMagnetic storage
WMagnetic stripe card
WMagnetic switchable device
WMagnetic tape
WMagnetic Tower of Hanoi
WMagnetogram
WMagnetometer
WMass driver
WMaxwell coil
WMEMS magnetic field sensor
WParametron
WProton magnetometer
WQibla compass
WSticky-shed syndrome
WTape drive
WTape head
WTranscranial magnetic stimulation
WVibrating-sample magnetometer
WVolta Laboratory and Bureau
WWhee-lo
WWiegand Sensor
WWooly Willy