Sign of hesitation with more than one note that's double dotted (6)
I believe the answer is:
umlaut
(Other definitions for umlaut that I've seen before include "Mark over vowel in German to indicate change in pronunciation" , "Two dots put over a vowel in German" , "In German, written mark indicating change in vowel pronunciation" , "Dots over vowel, as in Koln" , "German mark over a vowel, consisting of two dots" .)