Knight Commander

Knight Commander is the second most senior grade of seven British orders of chivalry, three of which are dormant. The rank entails admission into knighthood, allowing the recipient to use the title 'Sir' or 'Dame' before his or her name. In the British system of precedence, Knights Commander rank after the Order of the Companions of Honour and before Knights Bachelor.
The Orders that award the rank of Knight Commander, and related post-nominal letters, are :

Order of the Bath
Order of the Star of India
Order of St Michael and St George
Royal Guelphic Order
Order of the Indian Empire
Royal Victorian Order
Order of the British Empire

Knights Commander rank behind the most senior rank in each order, that of Knights Grand Cross. The third most senior rank in each order is a Companion for three-class orders and Commander for five-class orders.
Insignia include a breast star and a badge, worn from the neck on a ribbon.
It is also a grade in the orders of other countries, such as the Papal Order of St. Gregory the Great. The Italian equivalent is Commendatore.