The chain descending from the heaven is a symbol of:

The Chain of Justice is shown descending from heaven. This is how Jahangir described the Chain of Justice in his memoirs:
“ After my accession, the first order that I gave was for the fastening up of the Chain of Justice, so that if those engaged in the administration of justice should delay or practise hypocrisy in the matter of those seeking justice, the oppressed might come to this chain and shake it so that its noise might attract attention. The chain was made of pure gold, 30 gaz in length and containing 60 bells”.