- iodine laser
- ion drag
- ion drive
- ion migration
- ionization density
- ionized atmosphere
- ionopause
- ionospheric effects
- ionospheric index
- IR radiometer
- IS mask
- ISDN exchange
- ISM equipment
- iso-center
- isochronous circuits
- isolation
- isolation amplifier
- isotropic antenna
- isotropic radiation
- isotropic radiator
- isotropic source
- item code
- item mark
- item selector
- item size
- iterative network
- Jacobi polynomial
- jam signal
- jammer oscillator
- jerk loads
- johnson noise
- joint dependence
- joint loss
- joint user
- Joint venture
- judder
- jumper ring
- justification
- justification frame
- justified text
- K-display
- k-index
- iterated function
- iterative procedure
- ITU Regions
- J antenna
- jack panel
- jam-free
- jammer
- jet stream
- jitter noise
- jitter-free
- job management
- jogger
- Keplerien motion
- key diagram
- key in
- key letter
- key slot
- keyboard encoder
- keyboard sender
- keyed carrier
- keyed organization
- keyed signal
- keyer relay
- keying speed
- keypad
- keyshelf
- keystroke
- jet ink
- jettison
- jitter reduction
- job audit
- job deck
- judgment sample
- junction diode
- justification error
- justify
- key
- keyboard file
- keyboard scan
- keyer valve
- kHz
- kite
- klystron oscillator
- klystron repeater
- knot
- Kalman filtering
- kelvin scale
- key change
- key loader
- key sequence
- key system
- keyboard transmitter
- keyed file
- keyed pilot
- keying filter
- keying wave
- kickoff mechanism
- kinematics operator