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Pound, Ounce and Stone.
The United States customary system (also called American system or, sometimes, "English units") is the most commonly used system of measurement in the United States.
The system of measurement commonly used in most of the world is the SI or Metric system. Aside from that one, there are various others that are used in small areas by relatively few people. One of those is the "English" system, used in Burma, Liberia, and the USA.
It's the number system most commonly used numbe system in which there are ten digits (0123456789) that are counted before the numbers repeat to make larger numbers (10,11,12,13....)
From the times of the Etruscans (they invented them) to about 700 years ago when they were gradually replaced by the Hindu-Arabic numeral system.