Just guessing here, but educated guess... the altar thing between the two figures is what is referred to in the article as 'the altar', with the babylonian crescent moon symbol sitting directly on it in graphic relief... the crescent moon above is pretty much the same thing but represents the moon itself as opposed to the altar. The babylonians were moon worshippers. they actually had hundreds of gods but Sin/moon was a main one.

Same symbol still used by muslims today btw. Babylon is at the heart of today's modern Islam, with Mecca of course, but Babylon still very important which is why Saddam Hussein wanted to rebuild it.