Answer:
The Egyptian alphabet was known as small pictures that represent words as 'Hieroglyphs' Scientists found markings on old Egyptian walls and things for proof. If you are doing a project about Egyptians, Google 'Egyptian Hieroglyphs' for even more facts.
The Egyptians used the hieroglyphs mostly to just communicate. Really, it's like face-book/twitter: you can contact others by simply writing/typing to them. Or, you could simply write a letter.
They could of easily of left these marks to show that they had BEEN there. If you die, or every British person dies, then YOU would want to show that you had BEEN there, wouldn't you!?!
I'm also very sorry if I've spelt 'Hieroglyphs' wrong! (Lol!) <3 :-) Xxx