Proper noun
Arecibo message
(astronomy) An interstellar radio message broadcast on 16 November 1974 into the globular cluster Messier 13 in the hope that extraterrestrial intelligence might receive and decipher it.
Communication attempts by humans have included broadcasting mathematical languages, pictorial systems such as the Arecibo message and computational approaches to detecting and deciphering 'natural' language communication. Source: Internet
Many SETI searches assume that extraterrestrial civilizations will be broadcasting a deliberate signal, like the Arecibo message, in order to be found. Source: Internet
Shadow biosphere The Arecibo message (1974) sent information into space about basic chemistry of Earth life. Source: Internet