In Hebrew orthography, niqqud or nikud ( or ) is a system of diacritical signs used to represent vowels or distinguish between alternative pronunciations of letters of the Hebrew alphabet. Several such diacritical systems were developed in the Early Middle Ages. The most widespread system, and the only one still used to a significant degree today, was created by the Masoretes of Tiberias in the second half of the first millennium AD in the Land of Israel (see Masoretic Text, Tiberian Hebrew). Text written with niqqud is called "ktiv menuqad".