Yes, it's properly three truths, emptyness, dependent reality, and the middle. If you leave out the third you can't grasp Tiantai properly. I was reading Swanson's book, it's fantastic.
Dharani of Amoghapasa Avalokitesvara:
Om amogha-padma-pasa-krodhakarsaya praveshaya maha-pashupati-yama-varuna-kuvera
brahma-vesa-dhara padma-kula-samayan hum hum
heart mantra: Om amogha vijaya hum phat