The two dots above a letter, you mean, would be called a diaeresis and/or an umlaut.
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It means that the "U" now says oo as in boo
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
Just one. "Jackson" has two, "Jacksonville" has three. The syllables of a word are usually indicated by dashes or dots in the pronunciation key in dictionary definitions.
While holding down the alt key you type in 139. When you release the alt key an i with two dots should appear! :)