While holding down the alt key you type in 139. When you release the alt key an i with two dots should appear! :)
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(alt+ u) release (a)
in German they are called umlauts
It is two dots one on top one on bottom and a line in the middle From:Maddie
In pharmacy, a "T" with a dot over it denotes "one tablet." Two "Ts"l with 2 dots on top represent 2 tablets.
The two dots above a letter, you mean, would be called a diaeresis and/or an umlaut.