Radar, sonar, and lidar

Radar, sonar, and lidar are acronyms that have become words. An acronym is an abbreviation that is formed by taking the initial letters of the words in a phrase and creating a new word that is pronounceable. Examples of acronyms are UNICEF (United Nations International Children’s Emergency Fund) and NASA (National Aeronautics and Space Administration). Sometimes, acronyms are used so often […]
from Grammarist
https://grammarist.com/acronym/radar-sonar-and-lidar/