Printing Measurement (ENS) is a term used in the printing industry to refer to the size of a printed piece. It is usually measured in inches or centimeters and is used to determine the size of a printed item, such as a book, magazine, or poster. ENS stands for 'Envelope Size' and is used to indicate the size of an envelope that can be used to mail the printed item. This measurement is important for ensuring that the printed item fits properly into the envelope and is not damaged during shipping.