We would be doing you a disservice if we didn't talk about redundant acronyms.
We're talking about wordy offenders like ATM machine or PIN number. The M in ATM stands for machine, so you don't need to say it again. And what do you think the N in PIN stands for? Here's a hint: it's not nachos. Just saying the acronym might sound wrong, but it's correct. You could always just write out the whole thing, too.