➥ indriya: 'faculties', is a name for 22, partly physical, partly mental, phenomena often treated in the Suttas as well as in the Abhidhamma.

They are:

6 Bases (see āyatana):

• 1. eye: cakkhu
• 2. ear: sota
• 3. nose: ghāna
• 4. tongue: jivhā
• 5. body: kāya
• 6. mind: mano

Sex (see bhava):

• 7. femininity: itthi
• 8. masculinity: purisa
• 9. vitality: jīvita

5 Feelings (vedanā, q. v.):

• 10. bodily pleasant feeling: sukha
• 11. bodily pain: dukkha
• 12. gladness: somanassa
• 13. sadness: domanassa
• 14. indifference: upekkhā

5 Spiritual Faculties (see bala):

• 15. faith: saddhā
• 16. energy: viriya
• 17. mindfulness: sati
• 18. concentration: samādhi
• 19. wisdom: paññā

3 Supermundane Faculties:

• 20. the assurance: 'I shall know what I did not yet know!': aññātañ-ñassāmītindriya
• 21. the faculty of highest knowledge: aññindriya
• 22. the faculty of him who knows: aññātāvindriya.

(1-5, 7-8) are physical; (9) is either physical or mental. All the rest are mental.

(14) (see upekkhā) is here merely indifferent feeling (= adukkha-m-asukhā-vedanā, i.e. 'neither pleasant nor unpleasant feeling') and not identical with that highly ethical state of equanimity (= tatramajjhattatā, i.e. 'keeping everywhere the middle', the equipoise of mind), also called upekkhā which belongs to the group of mental formations (saṅkhāra-kkhandha; see Tab II).

(20) arises at the moment of entering the Sotāpatti-Path (Sotāpatti-magga), (21) on reaching the Sotāpatti-Fruition (Sotāpatti-phala), (22) at attaining the Arahat-Fruition (Arahatta-phala). For the three last, see ariya-puggala. The faculties, excepting (7) and (8), form one of the 24 conditions (see paccaya 16).

In Vibhaṅga V all these faculties are treated in the above order, whereas SN 4VIII enumerates and explains them by way of the above indicated groups, leaving only 20-22 unexplained. See Vis XVI; Path to Deliverance 138ff. - For the 5 spiritual faculties (15-19), see The Way of Wisdom (Wheel 65/66).