Like Common Lisp, Pixie Scheme maintains several variables that may prove handy should you forget to save an interesting input expression or output result. These variables use three characters not elsewhere used by Scheme, namely "ΓÇô" (optionΓÇôminus), "┬▒"
(optionΓÇôplus) and "┬░" (optionΓÇôasterisk).
Pixie Scheme will accept these characters ONLY in the names of these variables. These names are closely related to those used in