Yiddish was at one time the worldwide dialect of Ashkenazic Jews (the Jews of Central and Eastern Europe and their descendants). A hybrid of Hebrew and medieval German, Yiddish takes about three-quarters of its language from German, but scrounges phrases liberally from Hebrew and numerous other dialects from the numerous countries where Ashkenazic Jews have lived. It has a grammatical structure all its own, and is in writing in an letters founded on Hebrew characters. Scholars and universities classify Yiddish as a Germanic dialect, though some have interrogated that classification.