In many police procedural TV shows, when police officer try to told partners (or IT guys) the vehicle identification number (or flight number, driver license number, etc...), they will use full word to describe each letter of the number to make sure the information are clearly and unambiguously delivered, such as when describing ABM
, they may say Alpha Beta Merry.
So what is the terminology of this? It's something like "reversed acronym/initial", but what it is actually called?