Chemical element of metals. Cu comes from Cuprum, Fe comes from Ferrum, Ag from Argentum. The symbols were not followed by a period (full stop) as with abbreviations. Later chemical elements were also assigned unique chemical symbols, based on the name of the element, but not necessarily in English. For example, sodium has the chemical symbol 'Na' after the Latin "natrium". The same applies to "W" (wolfram) for tungsten, "Fe" (ferrum) for iron, "Hg" (hydrargyrum) for mercury, "Sn" (stannum) for tin, "K" (kalium) for potassium, "Au" (aurum) for gold, "Ag" (argentum) for silver, "Pb" (plumbum) for lead, "Cu" (cuprum) for copper, and
Au pair organizations in the United States Department of State requires that Au Pairs are: These are the 17 agencies designated by the State Department to administer the au pair program, although two have the same address: Au pair organizations in the United States An au pair organization is an agency which complies with (which deals with foreign relations—specifically, au pairs.) This program allows foreign nationals between the ages of 18 and 26 to live with a host American family for one year, with a one-year extension permitted. To comply with the regulations, most au pair organizations hire a local coordinator. Au pair organizations must follow guidelines