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Saiddhantika
Non - Saiddhantika
The Kalagni Rudra Upanishad , is one of the minor Upanishads of Hinduism, written in the Sanskrit language. It is attached to the Krishna Yajurveda. It is one of 14 Shaiva Upanishads.
The Upanishad is a discourse by Kalagni Rudra to sage Sanatkumara on the Tripundra, the Shaiva sectarian tilaka consisting of three horizontal lines of sacred ash on the forehead. The allegorical significance of the "three ash lines", states Deussen, is that the tradition sees them as streaks of three Vedic fires, three audible syllables of AUM, three Guṇas, three worlds, three Atmans, three Vedas and three aspects of Shiva. The text extols the Tripundra and tells about the procedure for applying Vibhuti as Tripundra on various parts of the body with the associated mantras and rites.