1) Orthography 2) The use of ideograms 3) Writing system 4) Writing system 
writing using signs representing ideas rather than sounds
• (n.) The representation of ideas independently of sounds, or in an ideographic manner, as sometimes is done in shorthand writing, etc.
I`de·og'ra·phy noun The representation of ideas independently of sounds, or in an ideographic manner, as sometimes is done in shorthand writing, etc. 
[n] - the use of ideograms in writing
noun the use of ideograms in writing
the use of ideograms.