Ideogram
Ideogram , noun
[Ideo- + -gram; compare French idéograme.]
1.
An original, pictorial element of writing; a kind of hieroglyph expressing no sound, but only an idea.
Ideograms may be defined to be pictures intended to represent either things or thoughts.
You might even have a history without language written or spoken, by means of ideograms and gesture.
2.
A symbol used for convenience, or for abbreviation; as, 1, 2, 3, +, -, {not transcribed}, $, {not transcribed}, etc.
3.
A phonetic symbol; a letter.