notational

The word "notational" refers to anything related to a system of notation: a set of signs, symbols, or marks used to represent information in a clear and ordered way. It is not just about writing words down. It is about using an agreed system to show ideas, instructions, quantities, or relationships.

The idea is strongly linked with music. Musical notation, with its staff, notes, rests, and clefs, is a classic notational system. It lets composers record music and helps musicians perform it accurately. But the word is also widely used outside music.

Mathematics depends heavily on notation. Algebra uses symbols like "x" and "y," calculus has its own written signs, and set theory uses braces and other special marks. Logic, linguistics, chemistry, and computer science also use their own notational systems. In all of these areas, the point is the same: symbols stand in for ideas in a compact and exact form.

The term is often used in contrast with verbal or descriptive ways of explaining something. A notational form shows the idea through symbols instead of spelling everything out in full sentences. For example, someone may talk about notational differences between two systems of logic or about a notational change in a piece of mathematics, meaning a change in how the symbols are written or used.

So, if something deals with a formal system of written symbols, it can be described as "notational." The word usually suggests structure, rules, and symbolic expression rather than ordinary everyday writing.