Return on investment is known as ROI. This term means different things to different people often depending on perspective and what is actually being judged so it's important to clarify understanding if interpretation has serious implications.
In simple terms this is the profit made from an investment. The 'investment' could be the value of a whole business in which case the value is generally regarded as the company's total assets minus intangible assets, such as debt. or the investment could relate to a part of a business, a new product, a new factory, a new piece of plant, or any activity or asset with a cost attached to it.