The Unicode Standard v. 5.1 has double dot (diaeresis) over the vowels ‘A’, ‘a’, ‘E’, ‘e’, ‘I’, ‘i’, ‘O’, ‘o’, ‘U’, ‘u’, and ‘y’ in Latin-1 Supplement, and over ‘Y’ in Latin Extended-A, as well as over the consonants ‘W’ and ‘w’ in Latin Extended Additional. This subrange contains additional characters with diaeresis. The Unicode Standard advises encoding characters of this type as a sequence of the baseline character and the COMBINING DIAERESIS (0308), and this way of encoding has been given as an alternative for each character below. Combinations with consonants and diaeresis are presumably rare in Medieval sources and therefore have not been included in the present recommendation.
LATIN CAPITAL LETTER AE WITH DIAERESIS
LATIN CAPITAL LETTER V WITH DIAERESIS
LATIN SMALL LETTER AE WITH DIAERESIS
LATIN SMALL LETTER V WITH DIAERESIS
LATIN SMALL LETTER A WITH DIAGONAL DIAERESIS
LATIN SMALL LETTER O WITH DIAGONAL DIAERESIS
LATIN CAPITAL LETTER J WITH DIAERESIS
LATIN SMALL LETTER J WITH DIAERESIS
LATIN CAPITAL LIGATURE OO WITH DIAERESIS
LATIN SMALL LIGATURE OO WITH DIAERESIS
LATIN CAPITAL LIGATURE PP WITH DIAERESIS
LATIN SMALL LIGATURE PP WITH DIAERESIS
LATIN CAPITAL LIGATURE YY WITH DIAERESIS
LATIN SMALL LIGATURE YY WITH DIAERESIS
LATIN CAPITAL LIGATURE AA WITH DIAERESIS
LATIN SMALL LIGATURE AA WITH DIAERESIS