It's some sort of memorial for Japan
so I'm going to assume they spell out ATOMBOMBLOLZ or similar.
( Mr. Tea burying dead greyhounds without a licence since, Mon 11 Jun 2012, 16:43, archived)

I think it is something to do with Godzilla or Hello Kitty.

( Monty Boyce "Get the h*** out of my store", Mon 11 Jun 2012, 16:53, archived)