in Brazillian portuguese it had a completely different meaning, and it was used for disambiguation of the pronounciation of some words, in short “gue” in portuguese can make a ghe (gh as in ghost) or a gue (gu as in guatemala), a similiar thing happens with “que”, this umlaug looklike was meant to make clear that the “u” was to be pronounced, so we had spellings like “freqüencia”
in Brazillian portuguese it had a completely different meaning, and it was used for disambiguation of the pronounciation of some words, in short “gue” in portuguese can make a ghe (gh as in ghost) or a gue (gu as in guatemala), a similiar thing happens with “que”, this umlaug looklike was meant to make clear that the “u” was to be pronounced, so we had spellings like “freqüencia”
That’s exactly the other meaning I described. In Portuguese it was/is used to separate the vowels so they are not pronounced together.