Siddhasutra, Siddhasūtra, Siddha-sutra: 2 definitions
Introduction:
Siddhasutra means something in Hinduism, Sanskrit. If you want to know the exact meaning, history, etymology or English translation of this term then check out the descriptions on this page. Add your comment or reference to a book if you want to contribute to this summary article.
In Hinduism
Shaktism (Shakta philosophy)
Source: Google Books: ManthanabhairavatantramSiddhasūtra (सिद्धसूत्र) refers to a “sacred thread”, according to the Kālikāpurāṇa chapter 76.—Accordingly, Śiva, the Lord (Bhagavat), has instructed Bhairava and Vetāla in the use of certain mantras.—“[...] Then whilst the two were immersed in meditation, engaged in repeating mantra and worshipping (the goddess) who is the universe, bursting apart the Liṅga, she then became visible. [...] (She was) lovely in all her limbs and her breasts were fat and upraised. (Two of her four) hands made boon-bestowing and fear-removing gestures and (with the other two) she held a sacred thread (siddhasūtra) and a sword. Radiant like a red lotus, she was seated on a white ghost. [...]”.

Shakta (शाक्त, śākta) or Shaktism (śāktism) represents a tradition of Hinduism where the Goddess (Devi) is revered and worshipped. Shakta literature includes a range of scriptures, including various Agamas and Tantras, although its roots may be traced back to the Vedas.
Shaivism (Shaiva philosophy)
Source: Brill: Śaivism and the Tantric Traditions (philosophy)Siddhasūtra (सिद्धसूत्र) or Ādisiddhasūtra refers to the “verse on (the Self) being (always) already established”, according to the Īśvarapratyabhijñāvivṛtivimarśinī.—Accordingly, “The highest level [of reality], although it is concealed to the highest point (parama-rahasya) within the [Śaiva nondualistic] scriptures, is absolutely never unmanifest; rather, it is always [in the process of] manifesting [itself]—this is the gist [of Utpaladeva’s answer]. And [Utpaladeva] has explained this in the verse on [the Self being] always already established (ādi-siddhasūtra)”.

Shaiva (शैव, śaiva) or Shaivism (śaivism) represents a tradition of Hinduism worshiping Shiva as the supreme being. Closely related to Shaktism, Shaiva literature includes a range of scriptures, including Tantras, while the root of this tradition may be traced back to the ancient Vedas.
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