notation notation /noʊˈteɪʃən/

noun

1. () A technical system of symbols used to represent special things  ( notational system , notation )
   a technical system of symbols used to represent special things
    The sheet music contained detailed notation for every instrument in the orchestra
   The sheet music contained detailed notation for every instrument in the orchestra
   
2. The activity of representing something by a special system of marks or characters  ( notation )
   the activity of representing something by a special system of marks or characters
   
3. A comment or instruction (usually added)  ( annotation , notation , note )
   a comment or instruction (usually added)
    His notes were appended at the end of the article
   his notes were appended at the end of the article
    He added a short notation to the address on the envelope
   he added a short notation to the address on the envelope