>>>>Redundancy!
>>>>
>>>>ICU Unit
>>>>ATM Machine
>>>>PIN Number
>>>>Tuna Fish (What other kind of tuna is there? Do we ever say I would like a Bacon Pig Hamburger Cow?)
>>>>VIN Number
>>>>and ...
>>>
>>>I'll give you the ridiculousness of ICU Unit and ATM machine, since the acronyms are 'spelled out'.
>>>
>>>Tuna Fish is part of the vernacular, I'm afraid, as is Cod Fish.
>>>
>>>But PIN and VIN are generally said as a word, so I guess people want to distinguish between a pin (a piece of metal with a pointy end) and a PIN by putting the 'number' after it.
>>
>>I agree with Jim.
>>
>>PIN was doomed and became"pin number" from the very start, although there do seem to be more people dropping the "number" nowadays, I'm pleased to note.
>>As for differentiating it from the metal artifact, I'd like to see someone "entering" a pin.
>>
>>As for ICU unit, I remember I got flak a few years ago for mentioning the redundancy of calling someone a "CIA agent"
>
>There's no redundancy in CIA Agent is there? One could be a CIA filing clerk, or a CIA Human Resources Manager. So why not a CIA Agent?

No because CIA is 'Central Intelligence Agency' and only a few are actually agents. There are different types of agents as well.