CAIRO, Oct 5 (Reuters) - Prominent Egyptian archaeologists have renewed a call for the return of the Rosetta Stone from the British Museum to Egypt, 200 years after the deciphering of the slab unlocked the secrets of hieroglyphic script and marked the birth of Egyptology.The archaeologists' online campaign has gathered 2,500 signatures so far and aims to "tell Egyptians what has been taken from them", said Monica Hanna, acting Dean of the College of Archaeology in the Egyptian city of Aswan.Register now for FREE unlimited access to Reuters.comBearing inscriptions of the same text in Hieroglyphs, Demotic and Ancient Greek, it was used by Frenchman Jean-Francois Champollion to decipher Hieroglyphs from 1822, opening up understanding of ancient Egyptian language and culture.Egyptian archaeologists have called previously for its return, but are hoping that increasing moves by Western museums to return artefacts that were removed from countries under colonial rule will help their cause.The museum is opening an exhibition entitled "Hieroglyphs: unlocking ancient Egypt" on Oct. 13 which sheds light on the role of the Rosetta Stone."