Easily-recognizable code

In telephony, an ERC is an easily-recognizable code for the North American Numbering Plan. This applies to all area codes that end in double digits, such as 800, 877, 900, 700 , and others not yet assigned. The state of Nevada requested that its new area code be "lucky" 777 ; this was denied by NANPA because it is an ERC, to be used only for special purposes like inward WATS -- they were granted 775, instead. Another such 'vanity' NPA code has now been assigned to the Titusville/Space Coast area of Florida: 321 .