Y  This is the terminal for cooling or air conditioning and goes to the compressor relay. Typically a thermostat wire pull is made to the air handler on split systems and then this wire is spliced for the separate wire pull which is made to the condenser.
profound (comparative more profound, superlative most profound) 1  Descending far below the surface; opening or reaching to great depth; deep. 2  Very deep; very serious. 3  Intellectually deep; entering far into subjects; reaching to the bottom of a matter, or of a branch of learning; thorough a profound investigationâ. a profound scholarâ.
Definition of mystical. 1  1a : having a spiritual meaning or reality that is neither apparent to the senses nor obvious to the intelligence the mystical food of the sacramentb : involving or having the nature of an individual's direct subjective communion with God or ultimate reality the mystical experience of the Inner Light.