A diaresis is two dots above the second of a pair of vowels to show that you pronounce each vowel; it’s not a diphthong. Perhaps the most common example is in the word coöperative, or maybe naïve.
Here’s another, from the New Yorker, of course:
Usually people use a hyphen because they don’t know how to make a diaresis. Hence, re-evaluate and co-operative. That’s okay.
Here’s a picture of the ASCII codes for the diaresis:
PS—I think it’s slightly funny that we don’t spell it diäresis…
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Rogers George has been a technical writer for more than 20 years. He has written on subjects as diverse as outhouse assembly, restaurant reviews, software, information security, and scientific equipment. He has his own writing consultancy and is always happy to discuss writing and grammar. Drop him a line at curmudgeon@writing-rag.com.
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