General terms:
* Symbolic expression: This is a broad term that could encompass any expression using symbols, including sentences, phrases, or even individual symbols.
* Symbolic language: Similar to the above, but can refer to a system of communication based on symbols.
* Code: If the symbols have a specific meaning, they can be considered a code, like Morse code or Braille.
More specific terms:
* Mathematical equation: If the symbols represent mathematical operations and values.
* Chemical formula: If the symbols represent elements and their arrangement in a molecule.
* Musical notation: If the symbols represent musical notes, rhythms, and other elements.
* Iconography: If the symbols are visual representations with specific meanings, often used in art or religion.
* Ideogram: If the symbols represent ideas or concepts, like some characters in written languages.
The best term to use will depend on the specific context and what the symbols represent.