Ever get a call from s scammer or annoying telemarketer? Don’t hang up, give them fake information. When you need to spell something, make it harder. Instead of “A as in Alpha, X as in X-Ray” say “A as in are, X as in xenon”.

Here’s a list of possibilities. There are more than one option for each letter. Hopefully they get confused and you need to elaborate. “No, No, not ‘r’, A as in Aisle, A as in Aural.”

There are several tricks here. One is to use homophones like Hour, Our, Are; best used together in the same word. Some are a reference to a different thing that is non-obvious until explained like saying sleep when you mean “ZZZ”. Another is silent letter like “Gnat”. The most common is non-phonetic consonant combinations like “Chasm”.

Word source: https://mctoon.net/2018/04/05/non-phonetic-alphabet/