The "KA" refers to the individual aspect of the spirit that dwells in the physical body, living vessel (vehicle) = (car). This aspect of the spirit is said to survive after beyond the body.

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Yoga, meditation, martial arts and various spiritual practices are known for bringing one's intimate awareness-connection to their "KA". The purpose of this connection is to build a spiritual relationship within self and strengthen one's co-creation with the will while alive in the body, ultimately preparing the "KA" for the transformation beyond the physical body (ascension)...