Which term expresses both quantity and direction?

The term that expresses both quantity and direction is "vector." In physics and mathematics, vectors are entities that have both a magnitude (which refers to the size or amount of the quantity) and a direction. For example, velocity is a vector quantity because it describes how fast something is moving in a specific direction.

Understanding the properties of vectors is crucial in various fields, as many physical phenomena are best described with directional information. This contrasts with scalar quantities, which possess only magnitude (such as temperature or mass), meaning they do not convey any directional information. Magnitude alone cannot signify direction, and while acceleration is a vector quantity, the broader term that encompasses both aspects is simply "vector." Thus, identifying vectors allows for accurate representation and analysis of motion and other vector-based phenomena in physics.