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.
The triple goddess sign is identified with Greek moon goddesses: 1  Artemis â the Maiden, because she is the virgin goddess of the hunt; 2  Selene â the Mother, for she is the mother of Endymion's children and loved him; 3  Hecate â the Crone, as she is associated with the underworld and magic, and so considered to be Queen of Witches.