What do you call the label of a point on a number line or on a coordinate grid?

The label of a point on a number line or coordinate grid is referred to as a coordinate. This term specifically describes the numerical value that indicates the position of the point relative to the established reference system. In a one-dimensional number line, the coordinate is simply a single number that represents the location of that point. In a two-dimensional coordinate grid, a coordinate is usually given as an ordered pair (x, y), where 'x' denotes the position along the horizontal axis, and 'y' indicates the position along the vertical axis. This precise labeling allows for clear communication about specific locations within the two-dimensional space defined by the grid.

Understanding the concept of coordinates is fundamental in mathematics, particularly in geometry and algebra, as it facilitates the analysis of relationships between different points and shapes on a graph.