What system provides a legally enforced measurement standard recognized worldwide?

The International System of Units (SI), commonly referred to as the International System, is the standard for measurements that is legally enforced and internationally recognized. It encompasses a coherent system of units that ensure consistency and clarity in scientific and commercial measurements across different countries. This system has been adopted globally to facilitate trade, scientific research, and communication.

The metric system, while a part of the International System, does not cover the entire range of measurements as comprehensively as the International System does. The Imperial System and the Customary System are specific to certain countries, mainly the United States, and do not hold the same international recognition or enforcement. Thus, the International System stands out as the authoritative global standard for measurements.