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.
1. a feeling or attitude of profound respect, usually reserved for the sacred or divine; devoted veneration. 2. an outward manifestation of this feeling, esp a bow or act of obeisance. 3. the state of being revered or commanding profound respect. 4. saving your reverence archaic a form of apology for using an obscene or taboo expression.