notation
nounUK /nəʊˈteɪʃən/
US /noʊˈteɪʃən/
A special way of writing things down, like notes or symbols.
The music teacher showed us the notation for each note on the page.
OTHER MEANINGS
2. A set of written symbols used in math or science.
Scientists use a special notation to show very large numbers.
3. The act of writing something down quickly.
His notation of the meeting was messy but useful.
4. A short note added to explain something.
There was a notation in the margin of the book.