Diacritical mark resembling a dieresis, both of which are represented in this puzzle (6)

I believe the answer is:

umlaut

(Other definitions for umlaut that I've seen before include "In German, written mark indicating change in vowel pronunciation" , "Mark over some vowels (in, eg, German)" , "Diacritical mark (two dots) placed over a vowel in German to indicate a change in sound" , "Mark indicating changed vowel value in German" , "Two dots put over a vowel in German" .)

I've seen this clue in The New York Times.

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