Siddha
Siddhas may broadly refer to siddhars, naths, ascetics, sadhus, or yogis because they all practice sādhanā.
[2] In Jainism, the term siddha is used to refer the liberated souls who have destroyed all karmas and have obtained moksha.They are free from the transmigratory cycle of birth and death (saṃsāra) and are above Arihantas (omniscient beings).
The Śvetāmbara Ācārāṅga Sūtra 1.197 describes siddhas in this way: The liberated soul is not long nor small nor round nor triangular nor quadrangular nor circular; it is not black nor blue nor red nor green nor white; neither of good nor bad smell; not bitter nor pungent nor astringent nor sweet; neither rough nor soft; neither heavy nor light; neither cold nor hot; neither harsh nor smooth; it is without body, without resurrection, without contact (of matter), it is not feminine nor masculine nor neuter.
A soul after attaining siddhahood goes to the top of the loka (as per Jain cosmology) and stays there till infinity.
"[citation needed] In Hindu theology, Siddhashrama is a secret land deep in the Himalayas, where great yogis, sadhus and sages who are siddhas live.
A list of eighty-four siddhas is found in a manuscript (manuscript no 48/34 of the Asiatic Society of Bengal) dated Lakshmana Samvat 388 (1506) of a medieval Maithili work, the Varna Ratnakara (devnagari: वर्ण-रत्नाकर) written by Jyotirishwar Thakur, the court poet of King Harisimhadeva of Mithila (reigned 1300–1321).
Thus siddha, like siddhar, refers to a person who has realised the goal of a type of sadhana and become a perfected being.
In Tamil Nadu, South India, where the siddha tradition is still practiced, special individuals are recognized as and called siddhas (or siddhars or cittars) who are on the path to that assumed perfection after they have taken special secret rasayanas to perfect their bodies, in order to be able to sustain prolonged meditation along with a form of pranayama which considerably reduces the number of breaths they take.
In Hindu cosmology, Siddhaloka is a subtle world (loka) where perfected beings (siddhas) take birth.
