The Nabataean alphabet is an abjad (consonantal alphabet) that was used by the Nabataeans in the second century BC. Important inscriptions are found in Petra (now in Jordan), the Sinai Peninsula (now part of Egypt), and other archaeological sites including Abdah (in Israel) and Mada'in Saleh in Saudi Arabia.
The alphabet is descended from the Aramaic alphabet. In turn, a cursive form of Nabataean developed into the Arabic alphabet from the 4th century, which is why Nabataean's letterforms are intermediate between the more northerly Semitic scripts (such as the Aramaic-derived Hebrew) and those of Arabic.
As compared to other Aramaic-derived scripts, Nabataean developed more loops and ligatures, likely to increase speed of writing. The ligatures seem to have not been standardized and varied across places and time. There were no spaces between words. Numerals in Nabataean script were built from characters of 1, 2, 3, 4, 5, 10, 20, and 100.
The Nabataean alphabet (U+10880–U+108AF) was added to the Unicode Standard in June 2014 with the release of version 7.0.