"Kalach Pitchei Chokhmah," an 18th century Jewish text, teaches that the entirety of all that exists is called "Adam Kadom" (Primordial Adam).
Kalach Pitchei Chokhmah 12, Sefaria, accessed February 15, 2022
The entire government of the universe in all its cycles until its completion, and so too, the totality of all that exists, all comprise one single system and one order instituted by the Emanator, blessed be His Name, with one goal: to bestow goodness to the utmost degree of perfection. All of the various different creatures and the laws through which they are governed are necessary for the fulfillment of His plan. Underlying the entire order is the archetypal Likeness of Man (דמות אדם, d’mut Adam) with his full complement of limbs. All are linked together in a single system, exactly as they are in man. Accordingly, Adam Kadmon, which is the totality of everything, is the totality of this order formed in this likeness. It follows that the Emanator, blessed be His Name, brought into being a single existence: the Order of the Likeness of Man. The totality of everything that exists, including all of the various creatures and the order by which everything is governed, is bound up with this underlying perfect likeness. . . .
And therefore, Adam Kadmon, which is the totality of everything, is the totality of this order formed in this likeness. We will see clearly below (Opening 31) that the entirety of all that exists is called Adam Kadmon (“Primordial Adam”). All of the worlds above and below are considered to be only parts of this, like branches emerging from the root. Everything in its entirety is this Adam Kadmon, and as discussed later, “The Ten Sefirot of Adam Kadmon fill the entire void”, as will be explained in due course with the help of Heaven.