The Atari ST did display bombs when an application crashed. But it was never part of the character set. It's a graphic that is displayed by the trap handler in

The Atari ST did display bombs when an application crashed. But it was never part of the character set. It's a graphic that is displayed by the trap handler in the operating system. The number of bombs indicate the trap type, so three bombs means trap handler 3 (address error). The symbols that do exist, but was not included in the proposal was the Atari logo and the J.R. Dobbs picture. Both of which are copyrighted, which is why they are included.