THE THIRD LOGOS is referred to variously as the Seven Rays, the Seven Creative Powers, or the Seven Logoi. The Second Logos contains in itself the Third Logos and manifests through and as this Third Logos, as was mentioned a moment ago. If we call the First Logos latent potentiality and the Second differentiated consciousness, we can refer to the Third as the ultimate differentiation of the Second, in the form of individualised cosmic forces. From them “will proceed the innumerable series of Hierarchies.”

Source: https://blavatskytheosophy.com/the-three-logoi/