Dutch does this. Idea is idee, with the e doubled to show it's a long vowel. We make plurals by adding "en". One idee, two... ideeen? Idewhat? So the dots differentiate where the sound changes (long e to short e): ideeën. Approximate pronunciation could be "ID an"

Fun fact: if you have the audacity to correctly write an SMS, you can fit about 70 characters in an SMS. It converts the whole message into multibyte instead of only adding dots to the one character. Or if you use classic spelling for naïve in English, same issue. (We don't dots-ize that in Dutch because ai is not a single sound like ee is, so there's no confusion possible. This is purely English.) I believe in Hanlon's razor so it's probably a coincidence that whoever cooked up this terrible encoding scheme made carriers a lot of money, but I do wonder if this had anything to do with the bug still existing to this day!