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The two dots above a letter, you mean, would be called a diaeresis and/or an umlaut.
While holding down the alt key you type in 139. When you release the alt key an i with two dots should appear! :)
You spread the dots apart?? Derrrp :D
It is two dots one on top one on bottom and a line in the middle From:Maddie
Difference of two squares.