6×6

6×6, pronounced "six by six," is a notation used to describe a dimension, grid, or drivetrain configuration across various fields. It commonly conveys a square layout of six units by six units or the product of six and six. In mathematics, 6×6 equals 36, and a 6×6 grid contains 36 equal cells, arranged in six rows and six columns.

In puzzles and board games, 6×6 grids are used for various formats, such as square grids for word searches, strategy games, and variants of checkers or Go-like boards on a smaller scale. Coordinates on such boards are often labeled with letters for columns and numbers for rows.

In photography and film, the 6×6 format refers to square frames measuring 6 cm by 6 cm, a common medium-format option on 120 roll film. A typical 6×6 film roll yields about a dozen exposures, depending on the camera and frame spacing.

In transportation and construction, 6×6 denotes either a vehicle with six wheels all driven (six-by-six) or a timber post or beam with a nominal cross-section of six by six inches. The lumber is usually milled to a nominal size, commonly 5.5 by 5.5 inches in modern practice.

Other uses include grid-based design, tiles, and modules arranged in six-by-six units for architecture, manufacturing, or display purposes. Overall, 6×6 emphasizes symmetry across both dimensions, producing a square arrangement on a wide range of scales.