What does G.C.B. stand for? 

g.c.b.

The Most Honourable Order of the Bath is a British order of chivalry founded by George I on 18 May 1725. The name derives from the elaborate medieval ceremony for appointing a knight, which involved bathing (as a symbol of purification) as one of its elements. The knights so created were known as "Knights of the Bath". George I "erected the Knights of the Bath into a regular Military Order". He did not (as is commonly believed) revive the Order of the Bath, since it had never previously existed as an Order, in the sense of a body of knights who were governed by a set of statutes and whose numbers were replenished when vacancies occurred.The Order consists of the Sovereign (currently King Charles III), the Great Master (currently vacant) and three Classes of members: Knight Grand Cross (GCB) or Dame Grand Cross (GCB) Knight Commander (KCB) or Dame Commander (DCB) Companion (CB)Members belong to either the Civil or the Military Division. Prior to 1815, the order had only a single class—Knight Companion (KB)—which no longer exists. Recipients of the Order are now usually senior military officers or senior civil servants. Commonwealth citizens who are not subjects of the British monarch and foreign nationals may be made Honorary Members.The Order of the Bath is the fourth-most senior of the British Orders of Chivalry, after The Most Noble Order of the Garter, The Most Ancient and Most Noble Order of the Thistle, and The Most Illustrious Order of St Patrick (dormant).

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