What term describes any measurement of performance or efficiency?

The correct answer is "Metric." A metric is a quantifiable measure that is used to assess the performance, efficiency, or effectiveness of a strategy, process, or operation. Metrics provide a way to evaluate and compare performance across various dimensions, making them essential in fields such as business, project management, and support center operations. They can encompass various dimensions, such as response time, resolution time, customer satisfaction scores, and more.

While the other terms also relate to measurement and performance, they serve different purposes or contexts. An "Indicator" is often a sign or piece of data that points to a trend or condition but does not necessarily reflect a quantitative measure by itself. A "Benchmark" refers to a standard or point of reference against which things may be compared, which is helpful for gauging performance relative to industry standards or best practices. Lastly, a "Standard" denotes an established norm or requirement that can guide performance but does not automatically provide a metric for measurement in itself.

Thus, in the context of measuring performance or efficiency, "Metric" represents the most direct and appropriate term.