notation

Concise Oxford English Dictionary © 2008 Oxford University Press:
notation/nəʊˈteɪʃn/

▶noun

• 1 a system of written symbols used to represent numbers, amounts, or elements in a field such as music or mathematics.

• 2 an annotation.

– derivatives
notate verb,
notational adjective,
notationally adverb,
notator noun.

– origin C16: from L. notatio(n-), from notare (v.), from nota ‘mark’.