Helicopter hieroglyphs refer to an Egyptian hieroglyph carving from the Temple of Seti I at Abydos.
In paleocontact hypothesis circles  the hieroglyphics have been interpreted as an out-of-place artifact depicting a helicopter as well as other examples of modern technology. This claim is dismissed by Egyptologists who highlight this pareidolia is partly based on widely distributed retouched images that removed key details from the actual carvings.
The anomaly is the creation of a text being reused by following generations. The initial carving was made during the reign of Seti I, and the stone was later reused during the period of Ramesses II with one carving being on top of the other. This palimpsest effect coupled with erosion creates the carving in situ.