Repeated echoes are called reverberations. They occur when sound waves reflect off surfaces multiple times, creating a persistence of sound in a space.
Reverberations.
Echoes of sound and images in a mirror involves sound waves and light waves respectively being reflected off a surface.
Reflection.
Echoes means the repetition of a sound caused by the refection of sound and waves.
This is probably Echo.
Sound waves are longitudinal waves; they travel from side to side, not up and down like transverse waves.
A really big iPhone
Sonar uses echoes to locate objects by bouncing sound waves off them and detecting the echoes.
Echoes of sound and images in a mirror involves sound waves and light waves respectively being reflected off a surface.
They both have reflection
Echoes can be heard in environments with hard and flat surfaces that reflect sound waves, such as mountains, canyons, buildings, or empty rooms. When sound waves bounce off these surfaces and return to the listener, an echo is produced.