What unrelated (or not) abbreviations/acronyms are like ICBM, for whatever reason?

Edited to add:
What is interesting about ICBM and what other abbreviations/acronyms (unrelated but not necessarily) are like it?
By “unrelated or not”, I mean the topic of missles.
Added: If you see my tags my question is not about missles, wars, but how to make abbreviations. There are 3 words in the term Intercontinental Ballistic Missles, not 4. Intercontinental is one word.
https://tinyurl.com/y8bo6ccm (Intercontinental/ definition/ Google)