Now that I think about it, and I don't know if this exists yet, but APL would probably very much benefit from having a Scratch-like or Factorio-like visual editor paired with a touch interface. You would drag and drop symbols, and long-pressing a symbol would popup its definition.
You could also probably do nice things with the symbol "icon blocks" themselves, and provide them with colors or different visualizations to convey different contextual meanings.
You could also probably do nice things with the symbol "icon blocks" themselves, and provide them with colors or different visualizations to convey different contextual meanings.