What is an O with two dots over it?
Category:
technology and computing
computer peripherals
In many languages, the letter "ö", or the "o" modified with an umlaut, is used to denote the non-close front rounded vowels [ø] or [œ]. In languages without such vowels, the character is known as an "o with diaeresis" and denotes a syllable break, wherein its pronunciation remains an unmodified [o].
Thereof, what is the O with two dots over it called?
diaeresis
One may also ask, how do you type Ö?
With a standard keyboard, hold down "Alt" with a finger of your left hand and at the same time type the numerical code which corresponds to the vowel you want: ä = 0228; ö = 0246; ü = 0252; and ß = 0223.
The two dots above the "i" are called diaeresis. As an unitalicized English word, "naive" is now the more usual spelling, although "naïve" is unidiomatic rather than incorrect. For more, look up this. I know that in Spanish we use a diaeresis on top of letters to emphasize the pronunciation of that specific letter.