Whether you are an old hand at APL, or someone just discovering the language, having the symbols in the standard layout right there on your keyboard is a great help… dedicated APL keyboards are pretty expensive, so consider these stickers that let one adapt any standard desktop or laptop keyboard!
APL keyboard sticker set on Tindie
To set up your keyboard for APL programming on Linux, see here.
APL, in my Lemmy?! Huzzah!