The pilcrow is a symbol used to denote a new paragraph. In the Middle Ages, before the convention of starting a paragraph on a new line, it was used to mark a change in the train of thought. It is also known as a paragraph mark or paragraph sign, and in proofreading it indicates where a new paragraph should begin. It is a symbol that appears in many character sets, and in page layout programs such as InDesign, a pilcrow marks every carriage return and can be seen when the invisible type features are made visible.