native phoneme/allophone in most modern Arabic dialects. Used in languages other than Arabic Numerals There are two main kinds of numerals used along with Arabic text; Western Arabic numerals and Eastern Arabic numerals. In most of present-day North Africa, the usual Western Arabic numerals are used. Like Western Arabic numerals, in Eastern Arabic numerals, the units are always right-most, and the highest value left-most. Eastern Arabic numbers are written from left to right. Letters as numerals In addition, the Arabic alphabet can be used to represent numbers (Abjad numerals). This usage is based on the order of the alphabet. is 1, is 2, is 3, and so on until = 10, = 20, = 30, ..., = 200, ..., = 1000. This is sometimes used to produce chronograms. History The Arabic alphabet can be traced back to the Nabataean alphabet used to write Nabataean. The first known text in the Arabic alphabet is a late 4th-century inscription from (50 km east of ) in Jordan, but the first dated one is a trilingual inscription at Zebed in Syria from 512. However, the epigraphic record is extremely sparse, with only five certainly pre-Islamic Arabic inscriptions surviving, though some others may be pre-Islamic. Later, dots were added above and below the letters to differentiate them. (The Aramaic language had fewer phonemes than the Arabic, and some originally distinct Aramaic letters had become indistinguishable in shape, so that in the early writings 15 distinct letter-shapes had to do duty for 29 sounds; cf. the similarly ambiguous Pahlavi alphabet.) The first surviving document that definitely uses these dots is also the first surviving Arabic papyrus (PERF 558), dated April 643, although they did not become obligatory until much later. Important texts were and still are frequently memorized, especially in Qurʾan memorization. Later still, vowel marks and the were introduced, beginning some time in the latter half of the 7th century, preceding the first invention of Syriac and Hebrew vocalization. Initially, this was done by a system of red dots, said to have been commissioned in the Umayyad era by Abu al-Aswad al-Du'ali a dot above = , a dot below = , a dot on the line = , and doubled dots indicated nunation. However, this was cumbersome and easily confusable with the letter-distinguishing dots, so about 100 years later, the modern system was adopted. The system was finalized around 786 by . Arabic