2by3

2by3 is a term used to describe configurations or measurements that are two units by three units, in other words a rectangle or grid with two rows (or a vertical dimension) and three columns (or a horizontal dimension). The expression is common across multiple disciplines to indicate size, shape, or structure in a concise form.

In mathematics and linear algebra, 2-by-3 denotes a matrix with two rows and three columns, typically written as a 2x3 matrix. Such a matrix contains six elements arranged in two horizontal lines of three. For example, a general 2x3 matrix can be represented as [ [a b c], [d e f] ].

In geometry, a 2-by-3 rectangle has an area equal to 6 square units and a perimeter of 10 units when the sides are measured in the same unit. A two-by-three grid consists of two rows and three columns of equally sized cells and is a common basic layout in puzzles, seating plans, and user interfaces.

In photography and printing, 2x3 inch prints are a small format often used for wallet photos or contact sheets, though many consumer printers standardize on larger sizes such as 4x6 inches. In design, 2-by-3 grids can serve as simple layout blocks or thumbnail arrangements for compact compositions.

The term can also refer more generally to an object with the 2:3 ratio in one dimension relative to the other, depending on the field. Context determines whether 2by3 describes physical dimensions, a matrix, or a grid.