notation

noun ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about notation at Wordnik → Where our words come from →

1. A technical system of symbols used to represent special things.
2. A comment or instruction (usually added).

   his notes were appended at the end of the article

3. The activity of representing something by a special system of marks or characters.