If anyone's interested, the double acute means that the vowel is longer than a regular ö or ü (there's no ä in Hungarian BTW). Same for á é í ó ú, with the adde

If anyone's interested, the double acute means that the vowel is longer than a regular ö or ü (there's no ä in Hungarian BTW). Same for á é í ó ú, with the added complication that a and e are pronounced differently. ...and kudos to salon for getting Rubik's name right!