I know that both are used rather cavalierly, but as I understand it, umlaut is the vowel change itself and dieresis is the written diacritical mark used to indicate the vowel change... except in German, where they are synonymous. Is Haagen-Dasz German ice cream?
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TeoContrary to common belief, the name is not Scandinavian; it is simply two made-up words meant to look Scandinavian to American eyes (which is quite ironic as "z" is rarely used in the Scandinavian languages). This is known in the marketing industry as foreign branding (and also similar to the heavy metal umlaut). Mattus included an outline of Denmark on early labels to
Does Häagen-Dazs really look Scandinavian to Americans?Sort of. Pseudo-Scandinavian, at least.