Cuneiform times of Parthian Empire (250 BC – AD 226). The last known cuneiform inscription, an astronomical text, was written in 75 AD. The complexity of the system prompted the development of a number of simplified versions of the script. Old Persian was written in a subset of simplified cuneiform characters known today as Old Persian cuneiform. It formed a semi-alphabetic syllabary, using far fewer wedge strokes than Assyrian used, together with a handful of logograms for frequently occurring words like "god" and "king". Ugaritic was written using the Ugaritic alphabet, a standard Semitic style alphabet (an "abjad") written using the
Ur (cuneiform) in many Amarna letters. The cuneiform "ur" cuneiform character (no. 575) is built in a 'rectangular box form', sitting upon a long horizontal stroke. It contains the 2-verticals at left and 1-vertical at right. Three other signs are similarly built, but contain 1-vertical at left, with 2-verticals at right for lu (cuneiform) (with 3-short horizontals in the center, no. 537), and the same but only 1-short horizontal at center, ib (cuneiform)(also "ip", no. 535). The third similar sign, (no. 536) has 1-vertical left and right, ku (cuneiform). It also has 3-short verticals in the center, but is often such a