Ideogram

Part of speech: noun (n.)

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. I. Taylor (The Alphabet). You might even have a history without language written or spoken, by means of ideograms and gesture. J. Peile.

2. A symbol used for convenience, or for abbreviation; as, 1, 2, 3, +, -,

3. A phonetic symbol; a letter.