Two Consciousness in the same body.
Brahm (ਬ੍ਰਹਮ. ब्रह्म) and Brahma (ਬ੍ਰਹਮਾ, ब्रह्मा): The One-ness (੧: ਇੱਕ) has two main components that make up the consciousness of sentient beings. The Brahm (ਬ੍ਰਹਮ, ब्रह्म) or Atam (ਆਤਮ. आत्म, higher mind) that many sentient beings do not always connect to.
The second one is the outer consciousness Brahama (ਬ੍ਰਹਮਾ, ब्रह्मा) or Atama (ਆਤਮਾ, आत्मा ) the identification of the self and the personality. Conceptually, this division can be considered as two opposed or contrasting aspects within the being, or the state of being divided.
Pooran-Brahm (ਪੂਰਨਬ੍ਰਹਮ, पूरनब्रह्म ): In its non- dual form the ੧: ਇੱਕ , has its outer self (ਬ੍ਰਹਮਾ, ब्रह्मा) merged back into its inner or higher consciousness (ਬ੍ਰਹਮ, ब्रह्म). It points to the essential One-ness (wholeness, completeness). The One-ness (੧: ਇੱਕ) now exists in this state through the contemplation (ਜਪੁ) through the Spiritual Wisdom of Gurmat or Veds.
Paarbrahm (ਪਾਰਬ੍ਰਹਮ, पारब्रह्म): The non-dual human consciousness is part of universal nature or consciousness through the Word, It is also known as Macro Cosmic Reality the omnipresence and omnipotent. It refers to the big picture, the Creator, which is nothing but a Micro unity to form Macro Cosmic Reality, and this reality is beyond words and concepts.
Note: The word Atma (ਆਤਮਾ) as per Gurmat or Veds is an indicative of ignorance or darkness. Hence the word “Parmatma” (ਪਰਮਾਤਮਾ) will indicate extreme ignorance.
Hence you will never find the usage of word Parmatma (ਪਰਮਾਤਮਾ) in Gurmat or Veds.
This word comes from the Vedanta Philosophy and is widely used in Upanishads who became known to larger population than Veds.