Heptapods are fictional extraterrestrial beings featured in the science fiction film Arrival, directed by Denis Villeneuve. They are characterized by their unique seven-limbed structure, which gives them their name. Heptapods communicate through a complex written language that resembles circular symbols, reflecting their non-linear perception of time. In the story, the arrival of heptapods on Earth prompts humanity to decipher their language and understand their intentions. The film explores themes of communication, time, and the impact of language on thought, highlighting the challenges and possibilities of interspecies interaction.