WordNet (r) 3.0 (2006):

writing system
    n 1: a method of representing the sounds of a language by
         written or printed symbols [syn: orthography, writing
         system]

The Free On-line Dictionary of Computing (19 January 2023):

writing system

    The set of glyphs used for
   representing a given human language in written form, generally
   along with their conventions for use.

   (1998-10-19)