The special name for the unit of land area in the metric system = 100 square meters = a square dekameter (approximately 119.599 square yards). In practice, the hectare (100 ares) is almost always used.
Recently the CGPM has been discouraging the use of the hectare in favor of expressing all areas in square meters.
According to the current national standard in the United States¹, the are is not to be used. Square meters should be used instead.
1. IEEE/ASTM SI 10™-2002.
American National Standard for Use of the International System of Units (SI): The Modern Metric System.
New York: IEEE, 30 December 2002.
See Section 3.3.3.
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Last revised: 27 January 2003.