The Nitrax Mathematical Keyboard is a compact physical keyboard designed to simplify the entry of mathematical, Greek, and scientific symbols in standard desktop applications. This technical reference documents its physical layout, two-layer symbol input method, Windows companion application, application compatibility, hardware characteristics, connectivity, privacy model, setup process, limitations, and troubleshooting procedures. The resource is intended for students, educators, researchers, engineers, scientists, and other users who regularly write mathematical or technical content. Official website:https://mathematicalkeyboard.com/ Full documentation:https://mathematicalkeyboard.com/full-documentation/ Open-source Windows software:https://github.com/NitraxMathematicalKeyboard/download-keyboard-layout Official technical reference page:https://mathematicalkeyboard.com/nitrax-mathematical-keyboard-technical-reference/ Preservation copy:https://archive.org/details/nitrax-mathematical-keyboard-technical-reference-v1-0