The Sumerian empire used wedge-shaped marks pressed into damp clay for keeping records.
This style of writing is known as Cuneiform Script. The word Cuneiform is adopted from the Latin word cuneus, means wedge. This style of writing was then adopted by Akkadian Empire.

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Musical Instruments: History, Technology, and Performance of Instruments of ...
By Professor of Musical Acoustics Murray Campbell, Murray Campbell, Clive A. Greated, Arnold Myers, Senior Lecturer in Music and Director Arnold Myers