"Diphthong" may be a thinko for "diacritic."

And the Unicode Consortium calls those two dots a "diaresis." A German umlaut looks the same, but has the function, more or less, of appending an "e" to the marked vowel. A diaresis, in languages I know that use it (English and Spanish) is placed over the second vowel to indicate that it is not participating in a diphthong but pronounced separately. They seem to be much less used these days in English, but in times past you wrote "coöperate" to indicate that the word was "co-op-er-ate", not "coop-er-ate."

Sorry for the grammar pedantry, but on the chance the OP was not a native English speaker I thought I would try to clarify the terminology, even though we all know what you meant.

In reply to Re^2: incorrect length of strings with diphthongs by Anonymous Monk
in thread incorrect length of strings with diphthongs by tos

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