Final answer:
A Key Performance Indicator (KPI) identifies a measurable element of a goal and is used in evaluation to see how communication efforts can provide return on investment.
Step-by-step explanation:
A measurable element of a goal that is used in evaluation to see how communication efforts can provide return on investment is called a Key Performance Indicator (KPI).
For example, if a company's goal is to increase brand awareness, one of the KPIs could be the number of social media followers gained.
By measuring this KPI, the company can evaluate the effectiveness of their communication efforts in achieving the goal of increasing brand awareness.