A vector is a linear algebra concept which correlates to an arrow or point in the plane. A variable that refers to a vector is often drawn with an arrow on top, as shown below. The arrow can either be a full arrow as or as a partial arrow (harpoon) as .

The components of a vector a denoted in various ways. This website uses angle brackets when writing the components of a vector in a horizontal layout.

Parentheses are used as well.

The unit vector notation is also used both with and without hats on the letters.

Finally, the components are also commonly written in a vertical notation.

The components of a vector are expressions that are represented with variables.

The components are also commonly references using the variable of the vector and a subscript number indicating the component position.