notation

nouns

a technical system of symbols used to represent special things
is derived from
a comment or instruction (usually added)
"his notes were appended at the end of the article"; "he added a short notation to the address on the envelope"
is derived from
the activity of representing something by a special system of marks or characters
is derived from
is a type of (narrower)
the activity of putting something in written form
"she did the thinking while he did the writing"