In German, Two Little Dots That Change the Vowel

This page is the CodyCross answer for the clue below from Amusement Park, Group 204, Puzzle 1 (Caramel Apple).

Question is: In German, Two Little Dots That Change the Vowel

and the answer is: UMLAUT

Word Meaning:

UMLAUT — (linguistics) An assimilatory process whereby a vowel is pronounced more like a following vocoid that is separated by one or more consonants.

Definitions from Wiktionary.