pdEngine (/ˈpedeengyn/)
The pdEngine is a small web game engine for learning purpose as part of my "How to build X" Collection.
Why Pd?
Pd is the chemical symbol for Palladium, which is often used for catalytic converter. A catalytic converter is an exhaust emission control device that converts toxic gases and pollutants in exhaust gas from an internal combustion engine into less-toxic pollutants by catalyzing a redox reaction. Catalytic converters are usually used with internal combustion engines fueled by gasoline or diesel, including lean-burn engines, and sometimes on kerosene heaters and stoves.
In short, catalytic converters are part of a conventional engine, nothing more. Therefore the chemical symbol seems fitting perfectly.