ICBM address
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ICBM address or missile address is hacker slang for one's longitude and latitude (preferably to seconds-of-arc accuracy) when placed in a signature or another publicly available file.
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Origin
The form that used to register a site with the Usenet mapping project, back before the day of pervasive Internet, included a blank for longitude and latitude, preferably to seconds-of-arc accuracy. This was actually used for generating geographically-correct maps of Usenet links on a plotter; however, it became traditional to refer to this as one's ICBM address or missile address, and some people include it in their sig block with that name. (A real missile address would include target elevation.)
Modern use
Today, using the ICBM method of coordinates is one method of geotagging webpages or other online material. Some projects like GeoURL and A2B allow people to include an ICBM address in their webpage via meta tags, which can then be used to map out sites added to its database.
Based on ICBM address from the Jargon File.
