Direct Currents is the name of several promotional features by DC Comics, including a long-running newsletter.
Direct Currents was first used as the name of a text feature appearing in DC's comics beginning in 1966.
[1] From the late 1970s to the early 1980s, the name was also used for one of the features in DC's Daily Planet house ads.
The phone number was so popular (it was receiving an average of 100,000 calls a week toward its end) that it had to be shut down due to strain on the telephone system.
Beginning in November 2016, the name was used for a free quarterly magazine offering sneak peeks of every DC title.