☄ U + 2604

The logo for Annihilation Event is Unicode + 2604, the comet emoji, sometimes referred to in online contexts as "head asplode".  Its emblematic origins in the celestial sciences might be traced through to ancient rock inscriptions.

Unicode is a computing standard for the consistent encoding, representation, and handling of text expressed in most of the world's writing systems. It is a way of making compatible then, of affiliating.The same code will express itself differently on different platforms, in different browsers and fonts.