- backward read
- backward signal
- automatic input
- automatic plotter
- automatic reading
- automatic restart
- automatic synchronization
- autopilot
- autumnal equinox
- available light
- axial slot
- automatic equipment
- automatic message
- automatic operation
- automatic scan
- automatic skip
- automorphic function
- axial gain
- axiom schema
- axisymmetric flow
- azimuthal deviation
- bad sector
- baffle
- balance error
- balanced mixer
- balanced mode
- balanced modulator
- balanced selection
- balancing coil
- balancing item
- balancing stripe
- balancing transformer
- ballistic flyby
- ballistics
- balloon
- balloon fights
- balloon satellite
- bamboo
- band centre
- band code
- band compression
- band edge
- band efficiency
- band level
- band printer
- band separation
- band-limit
- band-splitting
- bandwidth expansion
- bank balances
- base element
- base flow
- base impurities
- base line
- base modulation
- base pulse
- base region
- base resolution
- base segment
- base width
- baseband signal
- baseline
- baseline direction
- basic group
- basic service
- batch file
- batch queue
- batch request
- batch system
- batched environment
- beacon
- beam attenuation
- beam efficiency
- beam lead
- beam power
- beam sensor
- beam signal
- beam slewing
- bank charges
- bank contact
- Bank rate
- bar chart
- bar code
- bar generator
- bar graph
- bar pattern
- bar printer
- barium release
- barring facility
- bearer service
- beat note
- behavior
- Baravais lattice
- barrier grid
- base character
- base isolator
- base number
- base page
- base station
- base widening