I’ve searched for more information about Ψ and I’ve found some interesting things.
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@New_Era_News @twentyonepilots

The psi (capital Ψ, lower case ψ, Greek: ψι) is the 23rd letter of the Greek alphabet.
The psi is officially the letter sign for φ (phi) + σ (sigma).
ψ' is the Greek numeral for 700, ,ψ for 700 000.

Psi is also used as a general symbol for quantum mechanics, that is a fundamental theory in physics that provides a description of the physical properties of nature at the scale of atoms and subatomic particles. It is the foundation of all quantum physics.

One of the most important results of quantum mechanics is ‘Uncertainty principle’ / ‘Heisenberg uncertainty principle’ articulated by the physicist Werner Heisenberg, that the position and the velocity of an object cannot both be measured exactly, at the same time, even in theory

The most important conferences about quantum mechanics were The Solvay Conferences. They have been devoted to outstanding preeminent open problems in both physics and chemistry. The conferences were started by the Belgian industrialist Ernest Solvay and located in Brussels.

In Brussel, they speak French and Dutch but mostly French. The Bourbaki-group were French mathematicians. I haven’t found a clear connection between the conferences and the Bourbaki-group but the group has a connection with quantum mechanics.

This is called Hilbert Space. I don’t know how they are connected but here is a link with more information. https://en.wikipedia.org/wiki/Hilbert_space

I try my best to explain everything as clear as possible but I’m not a genius, I’m not that good at physics and English isn’t my first language :)

And now something else:
The designation psi is used in parapsychology as a neutral term for parapsychological phenomena such as extrasensory perception and psychokinesis. Psi is derived from the Greek word psyche (soul).

Parapsychology is a scientifically controversial field of study that investigates the existence and causes of psi (paranormal/parapsychic phenomena) and the possibility of an afterlife.

Psi refers to phenomena caused by living beings that cannot be explained by the laws and forces of nature.
Parapsychology investigates telepathy, proscopy, clairvoyance, telekinesis, reincarnation and ghosts.

Within parapsychology, "psi" is an unknown factor in extrasensory perception and psychokinesis (the supposed physical ability of humans to affect something physical without physical interaction) that cannot be explained by known physical or biological mechanisms.

This reminded me of the My Blood MV where is shown through flashbacks that the older brother is a coping mechanism, created by the younger brother, due to the childhood trauma he had experienced growing up.

This is all I’ve founded for now. I’m sorry for all the bad explained difficult math things (my head really hurts from it lmao) I’ll update when I found something

Oh and here is an interesting tweet about Ψ
Have a great day everyone!

#twentyonepilots https://twitter.com/New_Era_News/status/1336665611431272456