Symbol is a constructor but not a constructor

[Pentadome]

Boolean.prototype.constructor === Boolean // -> true
new Boolean() // -> Boolean {false}
Symbol.prototype.constructor === Symbol // -> true
new Symbol() // -> Uncaught TypeError: Symbol is not a constructor

Symbol is not a constructor, nevertheless, it is the value of Symbol.prototype.constructor. This is because, unlike booleans, symbols cant be explicitly boxed.