G2435–ἱλαστήριος–hilastērios

He it is whom God put forward as a Mercy-seat, rendered efficacious through faith in His blood, in order to demonstrate His righteousness-- because of the passing over, in God's forbearance, of the sins previously committed--

ἱλαστήριον hilastērion “a propitiation”

And above the ark were the Cherubim denoting God's glorious presence and overshadowing the Mercy-seat. But I cannot now speak about all these in detail.

ἱλαστήριον, hilastērion “mercy seat,”