Cyberglyphics

The cybertronian symbols are an old kind of writing symbols, seen on transformers, such as Megatron, Optimus Prime, and Soundwave. Younger Transformers don't know these cybertronian symbols and can't reed them(If the reecat all).

Revenge of the fallen film
After touchinga piece of the Allspark, Sam begins to see symbols, being a kind of map, that can bring him to the Solar Harvester. Megatron wants to have the information that sam has on his mind, so he And his master can activate the harvester.

Note

 * The symbols are hard to see in the movies, but they can be seen on concept art and the box art of games.