Saṃjñā (Pali: Saññā)

Saṃjñā is not a mythic being but a conceptual category that emerges from early Buddhist analyses of experience (the Nikāyas) and is subsequently elaborated in Abhidharma and commentarial literature (e.g., Atthasālinī, Abhidharma-samuccaya, Visuddhimagga). Classical texts locate it as one of the five aggregates (khandha/skandha) and as a universal mental concomitant in systematizations of mind; later commentaries refine its functional role as the faculty that notes, distinguishes, and 'marks' perceptual qualities enabling re-identification.

As a technical psychological term, saṃjñā has no physical form; descriptions are metaphorical. Commentarial imagery compares it to a carpenter's mark that allows recognition of a piece of wood, to a brief flash (like lightning) indicating its momentariness, and to a child 'without discretion' to indicate its limited discriminative power. These metaphors stress function (noting/marking) and limitations (brevity, superficiality) rather than sensory appearance.

Saṃjñā apprehends and notes distinguishing features of an object (e.g., perceives colors: 'it perceives blue…red…white'), makes a mental 'sign' or mark that conditions later recognition ('this is the same'), and confers conventional significance upon features through associative recognition. It functions together with citta (consciousness) and other cetasikas but carries out the specific task of recognition/labeling. Abhidharma-samuccaya describes it as 'to know by association' and classical summaries (Atthasālinī, Bhikkhu Bodhi) emphasize its role as the perceiving of qualities and maker of marks. It is momentary, can be superficial, and is subject to error (e.g., mistaking a scarecrow for a man).