This stone is one of a number found on Okinawa island in 1952 (?). The museum staff claimed both its meaning and date of origin are unknown. CC BY-SA sarmoung via flickr.
Here’s more:
This tablet has become known as THE 'Okinawan Rossetta Stone', and Professor Masaaki Kimura and his research team have speculated that the symbol to which the black arrow points might be a depiction of an 'underwater temple' - as at Iseki Point. Copyright © 2002 Dr. Masaaki Kimura
-- Okinawa, Japan -- via morien-institute.org.
Stone tablet from Okinawa, Japan. Via takashi1016.com.
