It's the helmet the Giant was wearing when Jack cut down the beanstalk..

it would have been so much easier in AutoCAD

I design housing developments (in America, and as part of that process blocks and individual house lots are indeed numbered. So it is possible to ind your house by block and lot number. Usually late in the development process, the city takes over and assigns addresses to the house lots, which becomes it's mailing address. But my tax records lists my property as Fairchild addition section 11, block 13, lot 6.
much more similiar to the japanese style.