ICBM address

ICBM address n.  (Also `missile address') The form used to
   register a site with the Usenet mapping project includes a blank
   for longitude and latitude, preferably to seconds-of-arc accuracy.
   This is actually used for generating geographically-correct maps of
   Usenet links on a plotter; however, it has become traditional to
   refer to this as one's `ICBM address' or `missile address', and
   many people include it in their {sig block} with that name.  (A
   real missile address would include target altitude.)