That would the symbol for the conjoined version of Mal Duncan and Firestorm after the Zeta Beam accident...
Much Better Versions of Modern Superheroes Crash in Savage Land
SAVAGE LAND - Both groups calling themselves Avengers got a nasty shock in the Savage Land last week as the investigation of a spaceship crash turned up something unimaginable. Roughly two dozen superheroes emerged from the wreck--except that these survivors seem to be a flashback to the recent past: all of them are "versions" of known superheroes from several years ago.
"It's like looking in my old photo album," said fugitive hero Spider-Man. "I mean, was I really that scrawny back in the day? Sheesh, no wonder Doc Ock used to kick my butt all the time."
Luke Cage (modern) said, "What kind of atrocious cliche is this? I never walked around saying 'Sweet Christmas'! Obviously this impostor knows nothing of my work."
Captain America (past) said, "We seem to have shown up at a bad time."
That may be the biggest understatement of the year, Cap. With the Skrulls having just taken out Iron Man (modern)... or have they?... as well as the Baxter Building, the SHIELD Helicarrier, the Raft, the Cube, and a bunch of other prominent superhero landmarks/facilities/headquarters, it seems that the arrival of a bunch of retrograde superheroes will only add to the confusion.
More news as it develops.
Artwork copyright Marvel Comics, all rights reserved