KC is a written short form of King’s Counsel. In Britain, and in some places that follow that legal system, a barrister is a lawyer who stands up and speaks in court. After many years, a very small number are given this high title by the Crown. It marks them as among the top courtroom lawyers. When a queen is on the throne, the same honour is written QC, Queen’s Counsel; when a king is on the throne, it is KC. The United Kingdom has a king now, so KC is the current form. Lawyers still sometimes say a person has “taken silk,” because of the silk gown these advocates wear. The letters KC can mean quite different things elsewhere — a city in the United States, for example — but this entry is only the British legal title. It is formal, professional English, not everyday talk.