Conversely, some foreign words have umlaut diacritics that do not mark a vowel produced by the sound change of umlaut. Notable examples are "Känguru" from English "kangaroo", and "Büro" from French "bureau". Here the diacritic is a purely phonological marker, indicating that the English and French sounds (or at least, the approximation of them used in German) are identical to the native German umlauted sounds. Similarly, Big Mac was originally spelt "Big Mäc" in German. In borrowings from Latin and Greek, Latin "ae", "oe", or Greek "ai", "oi", are rendered in German as "ä" and "ö" respectively ("Ägypten", "Egypt", or "Ökonomie", "economy"). However, Latin/Greek "y" is written "y" in German instead of "ü" ("Psychologie").