Later, Peter informs Langdon that the circumpunct Zachary tattooed on his head is not the Word. He also informs Katherine that he made back-ups of all of her noetic research data on his own computer, meaning her research can continue. Deciding to take Langdon to the true secret behind the Word, Peter leads him to the room atop the Washington Monument and tells him that the Word—a common Christian Bible, the Word of God—lies in the monument's cornerstone, buried in the ground beneath the monument's staircase. Langdon realizes that the symbols on the pyramid's base spelled out the words "Laus Deo" which translate to "Praise God". These words are inscribed on the small aluminum capstone atop the Monument, which is the true Masonic Pyramid.