It’s even worse tham that. Many letters can easily be confused for different letters, hence the reason for phonetic alphabets. I had one company who had an external system known as OAS, and some manager who maybe should have known about OAS, but had never worked with it decided to create an acronym OIS. Luckily the two systems were rarely talked about in the same context, but it still took me lots of mental effort to know which of the 2 systems various individuals were talking about in meetings when either were mentioned.