12 Branches of Excellent Speech: condensed, melodious, prophetic, verse, spoken with a purpose, conversatory, concerning his past lives, marvelous, establishing a truth, biographical, very detailed.
12 Branches of Excellent Teaching: sutras, poetic summaries, prophecies discourses in verse, intentional statements, contextual accounts, testimonies of realization, historical explanations, accounts of former lives, detailed explanations, wondrous discourses, definitive explanations.
12 Branches of Teachings: Sutra - discourses on a single topic. Geya - discourses in verse. Vyākaraṇa - prophecies of past lives and future possibilities. Gāthā - verse summaries in metered verse within sutras. Udāna - words spoken not to instruct particular individuals. Nidāna - explanations following a specific incident. Avadāna - life stories of buddhas, bodhisattvas, disciples, and various individuals. Itivṛttaka - historical accounts such as genealogies. Jātaka - accounts of previous lives of the Buddha. Vaipulya - lengthy sutras with complex organisation. Abidhutadharma - accounts of wondrous accomplishments of the Buddha, the disciples, and the bodhisattvas. Upadeśa - topics of specific knowledge. These are exact, profound, and subtle instructions on the nature of reality.
12 Great Deeds of the Buddha: existence in Tushita heaven, decent from Tushita, entering the womb of his mother,
birth as a prince, proficiency in the worldly arts, life in the palace, departure from home, practice of austerities, defeat of Mara, enlightenment, turning the wheel of doctrine, final nirvana.

12 Links of Dependent Origination: ignorance, volition/action/karma, consciousness, name and form), six sense organs, contact, feelings, desire/clinging, attachment/grasping, becoming/conception, birth, old age and death.
12 Sense Doors: the six internal sense organs or facilities, including cognition and their six associated six external sense fields.