"You've got a key for the 'for all' symbol (∀)," he said, "but no way to type a simple square root?"
For most of its life, this ghost was content. It watched over its simpler, mortal cousin: the caret (^). The caret was a busy, frantic key, used for exponentiation in code, for superscripts in word processors, for pointing upward in chat rooms. "Look what I can do!" the caret would chirp, raising numbers to dizzying heights. "I create powers!" radical sign on keyboard
But the true apotheosis came from an unexpected quarter: a novelist named Sasha. "You've got a key for the 'for all'
The radical sign would watch silently from its digital aether. Powers, it would think. But who undoes them? Who asks the inverse question? "Look what I can do
The ghost of the radical sign lived in the forgotten spaces of the keyboard. Not on the glossy, finger-worn letters of the home row, nor on the boastful, backlit gaming keys. It resided on the seldom-touched U+221A, a key that existed in no physical keyboard layout, only in the deep memory of Unicode.
Ken leaned over. "Then you're thinking like a printer, not like a coder. The radical isn't just a symbol. It's a function waiting for its argument. What if the key didn't type the sign, but invoked it?"
Then came the engineers.