Psion- Similar to pushions, they are particles from parapsychological phenomena such as magic.
Mordern magic makes use of these psion.
Magicians channel their psion into the CAD-
The digitized magic circle
[Activation Sequence] gets output by the CAD.
Using the body as a medium, the activation sequence gets absorbed by the magician.
The magician then sends that into his own mental system, [Magic operation zone], which only magicians possess.
The [spell] then gets assembled and magic gets activated.
Technobabble identified. Parsing...
"Parapsychological." Alright, that's a good one. The "para" prefix can basically mean anything related to the word, so "parapsychological," assuming various things about the translation, means that magic is in some way deeper than or parallel to mental processes.
In other words, magic is done with your mind or the thing under/beyond/above/to the left of your mind.
Okay, so the CAD. They explained earlier that the CAD is just a modern magic circle or equivalent; "digitized magic circle" is pretty much literally that.
Now we get to the good stuff. The activation sequence is output by the CAD. The magician absorbs the activation sequence using their body as a medium... so I guess flesh is conductive to activation sequences. The activation sequence is then sent into the "magic operation zone," apparently located somewhere in the user's "mental system." This zone then "assembles" and activates the spell.
So... what this is saying is that to use magic, a magician:
-Channels magic particles into their magic doohicky
-Magic doohicky outputs an activation sequence when infused with particles
-Caster reabsorbs the activation sequence through their meat, then shunts it to their brain or magical brain equivalency area, where it's assembled and happens
Or put simply, magic tools are poorly explained mirrors.