That would the symbol for the conjoined version of Mal Duncan and Firestorm after the Zeta Beam accident...
SUPER POWERED NEWS BITES
Batman Secret Identity Hoax
A recent media frenzy speculated a note (sprawled on a Gotham City mailbox) had revealed Batman's secret identity. That of billionaire Bruce Wayne. This week BPD has discovered a much less interesting though more insidious truth: America has punctuation issues.
Calvin Hogdutter just wanted to share a "goofy idea I'd gotten" with a friend who wasn't home at the time. "I just couldn't wait," said the cum laude grad, "so I wrote it on the mailbox. Who knew a comma changes the meaning of a sentence?!"
As in their mutual friend Wayne Peterson
of 1221 Lovecraft St, West Gotham.
Sadly, this information has also proven erroneous.