This is the Physics Acronym Dictionary. It holds the description for many acronyms found in High Energy Physics, but also Theoretical Physics. It has a focus on Particle Physics and therefore also holds descriptions to many acronymcs found at CERN.
To install it on linux, add
function awhat() {
python3 <YourPathHere> what $1
}
that function to your .bashrc and fill in the path to the PhysicsDictionary.py
In the PhysicsDictionary.py fill in the path to the .json file
json, sys, difflib