Short name for the National Astronomy and Ionospheric Center (NAIC) at Arecibo, Puerto Rico; often refers only to the NAIC 1000-ft (305-m) zenith (䔸°) antenna, the world's largest radio astronomy collector.

Arecibo Radio Observatory 86' 1997 Gregorian Enclosure manuf

The world’s largest radio telescope, it records signals for the SETI@home project. It is located in Puerto Rico. See also: SETI@home.