You’re reading the MWMB Blog (Mistake #56)

“Get that up on that mistakes blog of yours this second!” retorted a friend when I used the expression ‘PIN number’ in an email in passing.

It took me a few moments to work it out.

A PIN is, of course, a Personal Identification Number, and so is a ‘number’ by definition. You don’t need the extra ‘number’.

Likewise, and of particular interest and relevance to writers, are ISSN and ISBN – don’t tag a ‘number’ to those either, as they are International Standard Serial Number and International Standard Book Number, respectively.

PDF format, ADSL line, DVD disc and ATM machine – also tautologies, one and all, and you’re bright enough to work out why.

Wonderfully, this mistake even has a name, which comes with its own built-in irony – RAS Syndrome. That’s Redundant Acronym Syndrome Syndrome.

RAS Syndrome is very common in speech, of course, and nothing much to worry about in writing (unless you have a pedantic pal): it won’t cost you anything, an editor may not even notice it, and a sub-editor will cut the superfluous word if you do insert it in finished copy. Still, always nice to get it right, though.

Who’s got some others?

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