What is 1 - d?

1-d refers to a geometric dimensionality where an object or system has only a single dimension or axis. 1-d can be represented on a number line or a straight line, where there is only one direction of movement or change. It is a simplified way to represent objects or systems, and is commonly used in mathematical and scientific applications. Examples of 1-d objects include a line segment, a string, a wire, and a beam.