The twelve factors or links of conditioned existence are: ignorance (avidyā), mental formations (saṃskāra), consciousness (vijñāna), mind and matter (nāmarūpa), the six sense organs (ṣaḍāyatana), contact (sparśa), sensation (vedanā), craving (tṛṣṇā), clinging (upādāna), becoming (bhava), birth (jāti), aging and dying (jarāmaraṇa).

See “twelve links of conditioned existence.”