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 locale they serve. .cc, for example, is now operated by VeriSign. .hm represents a nature preserve with no human inhabitants. There are also two geographic top-level domain names assigned to Australia in which are used by individuals and businesses within a particular region, they are: .au .au is the Internet country code top-level domain (ccTLD) for Australia. It was first created on 5 March 1986. Domain name policy is managed by .au Domain Administration (auDA). As of July 2018, the registry is currently operated by Afilias. The domain name was originally allocated by Jon Postel, operator of IANA to Kevin