Echoed' The term 'SOUNDED LIKE SONAR' can be summarized by the crossword solution 'PINGED, ' which has 6 letters. This term is used to describe a sound that is similar to the sound of sonar, which is a technology used to detect objects underwater. Sonar works by sending out sound waves and then listening for the echoes that come back from the objects in the water. The term 'pinged' is used to describe a sound that is similar to this echo.