Analysis of information sources in references of the Wikipedia article "Diaeresis (diacritic)" in English language version.
...it is much less used than formerly, having been largely replaced by the hyphen...
The special tool we use here at The New Yorker for punching out the two dots that we then center carefully over the second vowel in such words as "naïve" and "Laocoön" will be getting a workout this year, as the Democrats coöperate to reëlect the President.