It means that the "U" now says oo as in boo
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The two dots above a letter, you mean, would be called a diaeresis and/or an umlaut.
Um. i don't know how to make an i with dots but i can do this Alt+142=Ä and Alt+148=ö hope that that helps you out
it has adkdgbsgbsd'g SD
What no they mean
uncompleted sentence.