Lepton appears to be the new official name for Valve’s version of Waydroid (Android in a Linux container).
We still don’t have a whole lot of details about how this is all going to work, outside of Lepton enabling Android APKs for developers on the upcoming Steam Frame VR kit, but it’s now that little bit more official with a proper name and even a logo.
I think they should’ve called it Electron, since a Proton is a specific particle (or more accurately specific combination of 3 Quarks = Baryon) while Leptons are a whole class of particles (electron, myon, tauon, Neutrinos).
I know Electron is already taken by the JavaScript Software Framework Tool, but still.
Gluon would be a great name to combine all these different tools with each other, where the correct Proton/Lepton/FEX or other (future) translation layers are used automatically, so the user doesn’t need to know that there a different technologies under the hood depending on what your trying to run