3by3

3by3, commonly written as 3x3, is a term used to describe anything with dimensions of three by three. It denotes a square layout or grid consisting of three units along each axis and is applied across fields to indicate a compact, evenly proportioned structure.

In mathematics and design, 3x3 grids appear as 3x3 matrices in linear algebra, and as modular blocks in computer graphics and user interface layouts. Sudoku, for example, organizes its puzzles into 3x3 subgrids within a larger grid.3x3 blocks also feature prominently in tiling patterns and in various visual compositions where a balanced arrangement is desired.

In games and puzzles, the most familiar 3x3 grid is used in tic-tac-toe, a simple two-player game. The 3x3 structure appears in a variety of sliding and logic puzzles as well, where players manipulate or arrange pieces on a 3x3 board.

In sports, 3x3 basketball—often written as 3x3 or 3-on-3—is a distinct format played on a half court with three players per team. Governed by FIBA, it has grown into a global discipline and was included as an Olympic sport at the Tokyo 2020 Games.

Beyond these, 3x3 appears in photography, video, and product design to describe grids for composition, galleries, or layouts. Across disciplines, the 3x3 structure provides a simple, versatile framework for organization and analysis.