noun
notation
noh-TAY-shun/nəʊˈteɪʃn/
A system of written symbols used to represent information.
The staff and notes form musical notation.

Etymology
Notation connects the act of marking with the marks used to record something. From a note or annotation, the meaning extended to an organized system of signs representing numbers or quantities.
In context
music notation follows the same logic: Without accidentals, the written notes correspond to the white keys on the piano, and we need sharps and flats
More examples
- She explained the mathematical notation before solving the equation.
- The symbols belonged to an unfamiliar notation.
- The map used a compact notation for terrain features.
Forms
notation · notations
notate verb — write using a system of symbols