this post was submitted on 19 Feb 2025
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[–] [email protected] 3 points 2 days ago* (last edited 2 days ago)

We call it tréma. Aka diaeresis. It explicitly tells you to pronounce two vowels near each other separately.
A typical use is to indicate a normally silent vowel must be read out. For example "maïs" (MA-EE-S') is completely different from "mais" (MAY).