notations
noun
Definitions
The act, process, method, or an instance of representing by a system or set of marks, signs, figures, or characters.
A system of characters, symbols, or abbreviated expressions used in an art or science or in mathematics or logic to express technical facts or quantities.
Example: The notations used in the two books differed. (Using notation would be incorrect).
A specific note or piece of information written in such a notation.
Example: She made a notation in the margin of the book.