10x20x

10x20x is a shorthand term used in various fields to indicate a rectangular dimension with two fixed sides, 10 and 20, and a variable third dimension denoted by x. It is not a single, universal notation, and its exact meaning depends on the context in which it appears. The trailing x signals that the third dimension has not been specified.

In geometry and related disciplines, 10x20x can be interpreted as the dimensions of a rectangular prism: length 10 units, width 20 units, and height x units. If x is treated as a variable, the prism belongs to a family of shapes with a volume of 200x and a surface area of 2(10×20 + 10×x + 20×x) = 400 + 60x. This interpretation assumes consistent units for all dimensions.

In packaging, manufacturing, and product catalogs, the format 10x20x is commonly used for labeling dimensions in the order length by width by height. When the height is not fixed or when multiple height options are offered, the final value may be omitted or left as a placeholder, signaling that the third dimension depends on the chosen variant.

In computing and data contexts, 10x20x can appear as a shorthand for array or tensor shapes with fixed first two dimensions and a variable last dimension. It is not a formal standard in programming languages, but it may be used informally to describe data structures or image resolutions where one dimension is unspecified.

Because the meaning of 10x20x varies by domain, it is important to consult accompanying specifications or documentation to determine the intended third dimension, units, and any related calculations. See also dimensions, rectangular prism, and tensor shape.