In ancient concepts of the subtle body, the Ida Nadi is one of the vertical channels (nadi).
The subtle body is a physiological system that is said to
exist on a distinct level of existence than the physical body, yet has certain
similarities to it.
It's shown as a series of six psychic centers (chakras) that
run nearly parallel to the spine and are joined by three parallel vertical
channels.
Shiva (consciousness) and Shakti (power), the latter as the
latent spiritual force known as kundalini, are located above and below these
centers.
The ida nadi is the left side of the body's vertical
channel.
The ida nadi, like the rest of the subtle body, has symbolic
correspondences; in particular, it is associated with the moon and hence seems
to be bright in hue.
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