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Notation
(noun)

- A system of signs or symbols used to represent something such as a number, musical notation, or mathematical formula.
- A system of symbols used to represent something such as a quantity or a process, especially in mathematics or music.

### Origin:

From the latin "notatio" meaning "marking, notation".

### Examples:

- She used a special notation in her math equations.
- The notation of music is used to write down compositions.
- The notation used to represent the mathematical formula was confusing.
- He was familiar with the notation used in the scientific study.
- The notation system used in the book was not clear.