What does the icon on the Harry Potter 7 mean?

Answer 1

It is the symbol of the Deathly Hallows. It it a triangle with a circle inside and a vertical line going down the middle. The three shapes represent each of the Deathly Hallows. The triangle represents the Cloak of Invisisbility, the circle represents the Resurrection Stone, and the line represents the Elder Wand. He who possess all three Hallows would become the Master of Death.