Which of the 140 historical royal ceremonial objects known as The Crown Jewels of the United Kingdom is known as the Sword of Mercy? 
Curtana: Curtana, also known as the Sword of Mercy, is a ceremonial sword used at the coronation of British kings and queens. Curtana:  One of the Crown Jewels of the United Kingdom, its end is blunt and squared, said to symbolise mercy. Crown Jewels of the United Kingdom: The Crown Jewels of the United Kingdom, originally the Crown Jewels of England, are 140 historic royal ceremonial objects, including the regalia and vestments worn by kings and queens of the UK at their coronations.
Curtana