https://en.wikipedia.org/wiki/Diacritic#English https://en.wikipedia.org/wiki/Diacritic#English "English speakers and writers once used the diaeresis more ofte

https://en.wikipedia.org/wiki/Diacritic#English https://en.wikipedia.org/wiki/Diacritic#English "English speakers and writers once used the diaeresis more often than now in words such as coöperation (from Fr. coopération), zoölogy (from Grk. zoologia), and seeër (now more commonly see-er or simply seer), but this practice has become far less common. The New Yorker magazine is a major publication that uses it."