harmonic signal

harmonic conversion transducer

harmonic conjugate functions

harmonic function

slow-wave space harmonic

Signal Kit / MK-79 (illumination signal kit)

acknowledgement signal

arm-and-hand signal

audio signal

caution signal

combined signal

command and signal

command signal center

control signal

distress signal (=SOS)

echo (returned signal)

field army signal brigade

flash a signal

forward area signal center

hand signal

hoisting signal flags

jamming signal

main signal center

prearranged signal

pyrotechnic signal

radio alarm signal

radio frequency signal

recognition signal

signal battalion

signal center

signal communication battalion

signal communications facilities

signal construction battalion