21×21

21x21 refers to a square canvas or image size where both the width and height measure 21 units. The unit of measurement is typically pixels in digital contexts, but it could also refer to inches, centimeters, or other physical dimensions depending on the application. A 21x21 image is considered very small by modern digital standards. This size might be used for small icons, thumbnails, or in applications where file size or loading speed is a critical concern and high detail is not required. In some specialized fields, such as early computer graphics or specific research applications, such dimensions may have held particular significance. The aspect ratio of a 21x21 image is always 1:1, meaning it is a perfect square. The total number of pixels in a 21x21 image is 441 (21 multiplied by 21). The term is straightforward in its description of dimensions and is generally understood without further context in graphic design and digital media.