Related Clues:
- Reflection of a kind
- Kind of cardiogram
- Bounce off the walls
- Reminiscent trace
- Radar blip
- Repeated sound
- Narcissus admirer
- Canyon call
- Dot on a radar screen
- Sound rebounded
- Many check for it by saying ''Hello!''
- Bounced-back sound
- Greek nymph who pined away for Narcissus
- You may test for it by saying ''Hello!''
- Microphone problem