Answer by Aasim Naseem Siddiqui:
Well .. this is really a controversial piece of hieroglyph in the temple of
Abydos. Some people (who claim that Egyptians had some contact with aliens) believe that this hieroglyph is real and in original form.
Some other says that the carving was altered by the successors of Ramses II (may be Merneptah). It was a common practice among Pharaohs of Egypt to destroy the symbols and glory of their forefathers, in order to showcase themselves. Example is Hatshepsut’s temple at Deir el Bahri, where statues and wall paintings were destroyed by her own son.
The temple of Abydos was build by Seti-I and finished by his son Ramses II, greatest of all Pharaohs. So it is natural that his successors tried to erase the trans of RamsesII from the mind of common people, and brought their own image at front.
My personal believes are, even if the hieroglyph were re-carved, the exact resemblance of modern tools/weapons in more then five different shapes leaves too many questions to explore. Merely saying it is a result of re-carving doesn't justify the situation. There is lot more to explore.