echo area

echo location/echo ranging

E – ECHO

echo (returned signal)

echo depth finder

echo sounder

echo sounding

bottom echo

bottom echo signal

coherent echo

coherent echo modulation and detection

Doppler echo indicator

echo frequency

echo intensity

mirror-reflection echo

precipitation echo

second-trip echo

echo

Echo (phonetic alphabet)

target echo

skin echo

area of war/war area

potential danger area (trouble area)

hazard area / hazardous area

killing area / kill area

open area danger area

active combat area

air defense area

aircraft over the objective area phase

airspace control area

amphibious assault area

amphibious assault force landing area

amphibious objective area (AOA)