Naiyayika (Skt. Naiyāyika; Tib. རིགས་པ་ཅན་པ་, Wyl. rigs pa can pa) is the name given to followers of the Nyāya School, a non-buddhist school of eternalism. The Naiyayika, or Logicians, are followers of the sage Brahmana Akshapada (rkang mig). Both the Naiyayika and the Vaisheshika claim that all objects of knowledge are included among six categories of existents:
A story describes how these six categories originate from an occasion when the sage Kanada was meditating before a lingam. An owl flew down and landed on the lingam. Thinking it must be an emanation of the almighty Ishvara, Kanada proceeded to question the bird. After simply nodding in response to six questions, the owl flew away. So it is that in this tradition all phenomena are explained in terms of six categories.