What does the DC in DC comics stand for?

This is an excerpt from a article on dailydot.com. To read the full article please click on the picture.

Originally launched as National Allied Publications, the company pioneered the concept of a comics featuring entirely original content. In 1937, NAP published Detective Comics #1, its first hard-boiled crime series. Detective Comics became the eventual birthplace of Batman in issue #27. Even before the Detective Comics’ popularity skyrocketed, the series was known colloquially as DC Comics. However, National Comics didn’t officially rebrand as DC Comics until 1977. Technically this means DC Comics’ original name, unabbreviated, is “Detective Comics Comics.”