Fibonacci is both a symbolic RPN calculator using Sympy with a programmable calculator using exprtk c++ for procedural operations.
The RPN front end is based on Richard Rondu's https://github.com/lainwir3d/sailfish-rpn-calculator
Many exprtk bits were developed with Babbage in mind.
The openrepos, chum and github versions include a keyboard called programmers which you can enable from Settings -> Text input -> Programmers keyboard.
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