Kill la Kill
Evangaleon
Blue Exorcist
The Devil is a Part Timer
Berserk
Death Note
K
A Boring World Where The Concept of Jokes Does not Exist
Psycho Pass
Elfen Lied
Soul Eater
Fairy Tale
Naruto
Answer: the MAC (Media Access Control) address
This is true. In some languages, constructors can be made private to restrict the ways in which objects can be created.