Flame Skull is a Titan insignia available in Titanfall. It is earned by dying while you're ejecting 10 times. This is currently the only insignia that requires you to die in some way to earn it. This challenge can be done through suicide, the easiest way being manually ejecting from a Titan and holding a Frag Grenade until it explodes. Another way being Nuclear Ejecting under a low ceiling, and double jumping before you hit the ground.