As arcanotech advanced, there was a backlash against applying popular science fiction and space opera terms to the emerging theories and technologies. Dirac space is theoretical space that exists inside of a much smaller space that shouldn't be able to contain it, such as a shoebox with the internal volume of a sports gymnasium. Theoretically fascinating, but almost useless for storage since one could only reach a few feet inside of it. This includes things like hyperdimensional storage, hammer space, bags of holding, and the rest.
The technology behind Dirac space isn't understood and devices that utilize Dirac space are not reliably creatable, aside from things like Dirac Batteries, often called dimensional batteries, which store a vast amount of power despite their small size. The electrons contained in a Dirac battery automatically move towards the access point when it is opened.
Also any other notation involving Gamma that is not specifically referencing gamma rays, is a shibboleth version of 'Here be Dragons'. Not so much a matter of ignorance or fear, but a note that this line of research is problematic or highly dangerous. Other examples include Gamma Interference, Gamma Inclusion, Gamma Acceleration, and so forth. It is also used as a expletive among arcanotechs and arcanoscience majors use gamma (gah-MAH!) interchangeable with the usage of Fuck!
to the vintage Nixie tube (give it a google, very retropunk, very cool)
Nixie is an adjective given to a piece of technology that was replaced
with newer tech before the old tech exceeded its projected lifespan.
Some Nixie tubes were projected to have a lifespan of 200,000 running
hours (or 22 years). With as rapidly as arcanotech advanced, quite a few
things became 'nixie'.
a modern context, vinyl record players are totally nixie, as are things
like automobiles that predate electronic engine controls. Nowhere near
cutting edge, but still completely reliable.
Early in the realm of arcanophysics and dimensional science there were extensive efforts made to incorporate existing theories of contemporary physics. There were serious conflicts as the old models included theories that weren't compatible with the new realm of science, like super string theory, the unifying field theory, relativity, and one that was particularly troublesome, the Einstein-Rosen Gate. References to Einstein-Rosen gates, or Einstein Gates, and eventually Stein Gates, became a shibboleth that has a composite meaning of a problem that cannot be solved, and fate.
There is something behind a Stein's Gate, but the phenomenon has yet to be discovered, but it features very prominently in dimensional science and arcanotech that deal with temporal mechanics and teleportation. These attempts fail, and they almost always create loops and bubbles with the same events, phrases, and outcomes occurring.