DIN 476 (Paper Sizes)

DIN 476 is a German standard that defines a series of paper sizes, known as the ISO 216 standard internationally. It establishes a logical system where each size is half or double of the next, based on the A-series (e.g., A4, A3). For example, folding an A4 sheet in half creates an A5 size, which maintains proportional dimensions. This standard streamlines printing, copying, and stationery, providing consistent and easy-to-remember dimensions for various uses worldwide.