Two Differences between the Partzufim of the First Three and the Partzufim of the Vav Ketzavot (Six Extremities) 62. Every partzuf emanates and is born from the partition of the body of the partzuf above it by means of cause and effect. This occurs in all the partzufim, from the partzuf of Keter of Adam Kadmon, which emerged after the first constriction (tzimtzum), until the end of the partzufim of the world of Asiya. Moreover, they enclothe one another; that is, every lower partzuf enclothes the body of its upper partzuf. For an explanation of the concept of partzuf, see above (section 57).146That section defines a partzuf as having a head, body and end, as opposed to a sefira which is one unit.
What Distinguishes a Partzuf From a Single Sefirah
Introduction to Sulam Commentary 62:1