As for the name, I figured it has a couple connotations. AT&T's Bell labs. Belle is French for Beautiful Bel is the 7th ASCII character and it use to ring an

As for the name, I figured it has a couple connotations. AT&T's Bell labs. Belle is French for Beautiful Bel is the 7th ASCII character and it use to ring an electro mechanical bell in computers, before they had speakers or sound cards. B is the second letter after A, with which Arc, his first Lisp variant was named. And both have three letters.