From wiki: "Out of the 17,576 possible TLAs (Three-letter acronyms) that can be created using 3 uppercase letters, at least 94% of them had been used at least once in a dataset of 18 million scientific article abstracts."
There are already so many conflicting TLAs out there.
All of those come from the same name, the International Organization for Standards. That's why disk images are also called ISO files. "Iso" is also a Greek prefix meaning "equal" which is a nice touch for a standards organization.