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Latin
Ishana (sanskr. Īśāna) - Literally translates into "Guardian of the North-east". In Indian mythology and Vaastu Shastra, North is the direction where knowledge resides (in the abode of Indra, the king of gods), while East is the direction where wealth resides (in the abode of Kubera, the god of wealth). So Ishana symbolizes the culmination of knowledge and wealth. Hence it is considered auspicious under Vaastu Shastra for homes and offices to face the north-east direction.
The name Ishana is also mentioned in Shiva Mahapurana as one of five names of the god (Shiva). Īśāna has its roots in the word "ish", which means the invisible power that governs the universe. The wielder of this power, or this power itself, is "Īśāna". It is synonymous with Ishwar, which means "The Lord". In Hindu Scriptures this is a name given to Shiva. As per Hindu scriptures Shiva has five heads, each denoting one of the five tattvas (elements) namely Fire, Earth, Air, Water and Ether (also called as Sky-element or akash-tattva in sanskrit) that make up the universe. This fifth head of Shiva faces the upward direction, towards the sky.
Īśāna signifies the subtle and ethereal form of Shiva that represents transcendental knowledge. This dimension is reinforced by which says that Ishanya-disha (north-eastern direction) represents Prosperity and Knowledge. It is also considered to be the name of the god of Vastu Śāstra. the Brahman splits into male (Parashiva) and female (Parasakti) and manifests as the universe. The Parashiva has five aspects:
Sadyojata - west aspect that propagates manifest Brahman-associated with brahma - represents earth.
Vamadeva - north aspect that sustains manifest Brahman - associated with Vishnu - represents water
Aghora - south aspect that rejuvenates manifest Brahman - associated with Rudra - represents fire
Tatpurusha - east aspects Rishi, Muni, Jnani, yogi - represents air
Isana - internal aspect that conceals - associated with all that exist - represents ether