What is the name of the Ikea bookcase?

What is the name of the Ikea bookcase? Billy (stylised as BILLY) is a bookcase sold by the Swedish furniture company IKEA. It was developed in 1979 by the Swedish designer Gillis Lundgren and IKEA have sold over 60 million units of the bookcases worldwide.

What are the Ikea square shelves called? KALLAX Series Storage Cubes – IKEA.