Adam is ADM, or Aleph Daleth Mem.And I heard the number of them which were sealed: and there were sealed an hundred and forty and four thousand of all the tribes of the children of Israel. Revelation 7:4
Aleph has the Kabbalistic value = 1
Daleth has the Kabbalistic value = 4
Mem has the Kabbalistic value = 40
So, 144 (or 144,000) is the number of Adam.
Adam is symbolic, it is in reference to Adam Kadmon, the Cosmos Human, the Heavenly Man.
Thus, Revelation 7:4 means that those who become the Adam Kadmon will enter Heaven.
Likewise, the Twelve Tribes represent the Twelve Zodical Signs under which the self realization of the Adam take place.