SD, But that means everyone would have to learn what those symbols mean.  Well I suppose an app could do it.  I can see some future archeoligist discovering Deady's plaque and wondering what all those "hieroglyphics" mean?  Hundreds of years of speculation and theories go by and then one day a historian decided to push a cord with some kind of connector into some other artificat and instantly, the "app stone" comes alive and suddenly, all is known.