Definition of pipe for English Language Learners. : 1  a long, hollow tube for carrying water, steam, gas, etc. : 2  a tube with a small bowl at one end that is used for smoking tobacco. : 3  a musical instrument that is in the shape of a tube, has holes along the top, and is played by blowing.
The Blood of Olympus (mentioned) Lupa is the immortal Roman wolf goddess who trains Roman demigods in the ways of Rome. She trains the demigods at the Wolf House, then sends them to Camp Jupiter where they can join the Twelfth Legion.
Ma'at (Maet, Mayet) is the Egyptian goddess of truth, justice and the underworld. She is often portrayed as wearing a feather, symbol of truth, on her head. She passed judgment over the souls of the dead in the Judgment Hall of Osiris. She also weighted up the soul against a feather. The Law of Ma'at was the basis of civil laws in ancient Egypt.