Backscattering is a term used to describe the reflection of a particle, such as light or sound, back towards the source. There are several synonyms for this word, each with their own unique nuances. One is "retroreflection," which refers specifically to the reflection of light back towards its source. "Reflectivity" is another synonym, which describes the degree to which a surface reflects light or sound. "Scattering" can also be used to describe the process of light or sound being redirected in different directions after it encounters an obstacle. Finally, "backscatter" is a more general term that can be used to describe any type of scattering that results in particles being redirected back towards their source.