Pāli Term: Indriya-saṃvara English Equivalent: Restraint of the Sense Faculties / Sense Restraint / Guarding the Sense Doors
Indriya: Refers to the "faculties" or "roots." In this context, it specifically refers to the six sense organs: Eye, Ear, Nose, Tongue, Body, and Mind.
Saṃvara: Refers to "restraint," "discipline," or "control." It implies a protective sealing off of the mind to prevent harmful influences from entering.
Restraint of the Sense Faculties is the practice of maintaining mindfulness at the moment of sensory contact.
When a practitioner sees a form with the eye (or hears a sound, smells an odor, etc.), they do not grasp at the sign (nimitta) or the details (anubyañjana).
The Sign (Nimitta): The general appearance or overall impression of the object that might trigger lust or anger (e.g., "a beautiful man/woman," "an enemy").
The Details (Anubyañjana): The specific features that deepen that reaction (e.g., "a charming smile," "an angry glare").
By "restraining" the faculty, the practitioner simply registers the data (seeing, hearing) without letting the mind generate craving (if the object is pleasant) or aversion (if the object is unpleasant).
It is not about physically closing one's eyes or plugging one's ears. It is a mental filter. It is called "restraint" because if one leaves the senses "unguarded"—reacting emotionally to everything one sees or hears—"taints, vexation, and fever" (greed, sadness, stress) will flow into the mind like water into a leaky boat.
In the Sabbāsava Sutta, this is the method of Abandoning by Restraining. The text states:
"While taints, vexation, and fever might arise in one who abides with the eye faculty unrestrained, there are no taints... in one who abides with the eye faculty restrained."