4-1-1
In most of the United States, 4-1-1 has for decades been the telephone number for local directory assistance. In recent years, in most areas, it has been used for long-distance directory assistance as well (the traditional number is 1-xxx-555-1212).It is also sometimes used as a slang term meaning information, e.g. "I need the 4-1-1 on the Penski file".
See also: 3-1-1, 5-1-1, 6-1-1, 7-1-1, 8-1-1, 9-1-1
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