Wikipedia
Ṣaḍāyatana
( Sanskrit) or ( Pāli) means the six sense bases (Pāli, Skt.: āyatana), that is, the sense organs and their objects. These are:
:# Eye and Vision
:# Ear and Hearing
:# Nose and Olfaction
:# Tongue and Taste
:# Skin and Touch
:# Mind and Thought
That is, in Buddhism, the sixth "internal" and "external" sense bases are: mind (Skt., manas; Pali, mano); and, thought (along with memory and emotion) (Skt., dharma; Pali, dhamma).