In yoga philosophy, what does the term "Sutra" refer to?

In yoga philosophy, the term "Sutra" specifically refers to a concise statement that encapsulates teachings or principles. The most famous example is the Yoga Sutras of Patanjali, a foundational text that distills complex philosophical concepts into succinct aphorisms. These sutras serve as a guide for practitioners, providing insights into the nature of yoga, the mind, and the path to enlightenment. Each sutra is a brief but potent expression of knowledge that invites deeper contemplation and understanding, hence making them a fundamental aspect of yoga philosophy.

Instead of extensive essays or visual representations, sutras provide a form of clarity and precision, making them essential for both study and practice in the yoga tradition. Such conciseness is crucial as it allows the teachings to be easily memorized and transmitted through generations. In contrast, the other options do not align with the true definition or purpose of a sutra in the context of yoga philosophy.