2by1

2by1 is a dimension notation used to describe a rectangle that is two units wide and one unit high. Commonly written as 2×1, it indicates a simple width-to-height proportion and appears in several fields such as mathematics, design, and media.

In mathematics and computer science, a 2×1 matrix or array has two rows and one column, typically representing a column vector with two elements. In tiling and games, a 2×1 rectangle corresponds to a domino tile; such tiles are traditionally sized to fit a compact, rectangular form and are a standard component of many domino sets.

In photography, film, and digital media, the ratio 2:1 (two-by-one) describes a widescreen proportion in which the width is twice the height. This aspect ratio is used in cinematography and certain display formats, and it can be achieved through camera settings, cropping, or the use of anamorphic lenses.

In manufacturing, packaging, and product design, 2×1 dimensions specify the footprint of small components, labels, or panels. The term can also appear in branding or product names to indicate a two-by-one size reference, even when exact measurements vary by application.

Overall, 2by1 serves as a versatile shorthand for describing a specific two-by-one rectangular dimension across mathematical, physical, and media-related contexts.