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The Arecibo message is a 1974 interstellar radio message carrying basic information about humanity and Earth sent to globular star cluster M13. It was meant as a demonstration of human technological achievement, rather than a real attempt to enter into a conversation with extraterrestrials.

The Arecibo reply was the name given to a crop circle that appeared in farmland next to the Chilbolton radio telescope in Hampshire, UK, on 19 August 2001. It was 75 feet wide and 120 feet long. The design is so named because it appears to be a response to the Arecibo message, which SETI transmitted into space in 1974