Early Semitic: In use around 1500 BCE and before by most Semitic tribes.

Middle Semitic: In use between 1500 and 500 BCE by most Semitic tribes. Continued to be used by the Hebrews into the first century AD.

Late Semitic: In use between 500 BCE and 100 CE by the Aramaen and Hebrews.

Modern Semitic: A similar script to the late Semitic used by modern Hebrews which evolved slightly from 100 CE to today.

Note: As each person writes slightly different from the next, Semitic inscriptions can also vary within the same time period.