Definition: In "In PX," a specific, powerful, and potent substance, or term of art used in religious texts to signify divine authority, power, or presence. Definition: The word "in PX" refers to a specific term that represents God's omnipotence (Hebrew: "INPX"), a phrase from the Old Testament which states that God is the one who does not cease to be. This phrase emphasizes his inviolability and sanctity of existence, as it implies he alone has power over the universe.