What is the term used for a single vector that is equivalent to a system of several vectors?

The term for a single vector that is equivalent to a system of several vectors is known as the resultant. In physics and engineering, the resultant vector is obtained by vector addition of individual vectors that represent different quantities, such as force or displacement. When multiple vectors are combined, the resultant encapsulates their overall effect, whether that be in direction or magnitude.

In practical terms, this concept is crucial in various applications, including mechanics and power engineering, where you may need to analyze the effects of multiple forces acting simultaneously. By determining the resultant vector, you can simplify complex systems into a single entity that is easier to understand and manipulate mathematically.

Other terms like 'X component' refer specifically to part of a vector in the horizontal direction and do not encompass the overall combination of vectors. 'Equilibrant' refers to a specific force that counterbalances other forces to achieve equilibrium, while 'scalar' defines quantities that have magnitude only and no direction, which is a different concept altogether.