mercy seat

noun2

1. •
   (Judaism) The lid of the Ark of the Covenant, on which God is said to have been enthroned; taken to represent the throne in heaven.

   • And thou shalt make a Mercieseat of pure gold: two cubites and a halfe shalbe the length thereof, and a cubite and a halfe the breadth thereof. — 1611
2. •
   Synonym of mourners' bench.