(Guṇa): Attribute; quality; strand. This word has many connotations, but the most common usage belongs to the vocabulary of the yoga and Samkhya traditions, where it refers to the well-known triad of forces—sattva, rajas, and tamas—that are thought to be the fundamental qualities of prakriti (Nature). These qualities are considered the primary dynamic forces of Nature, as they represent the principles of activity and dynamism (rajas), inertia (tamas), and harmony (sattva). Their combined interaction creates the entire manifest world. They underlie all material as well as psycho-mental phenomena.