Wargaming
Metal figures for tabletop wargaming and role-playing gaming are usually not described by scale ratio, but by the approximate height of a human figure, in millimeters. Manufacturers gradually enlarged the standard 25 mm figures of the 1970s, at first describing them as "large 25s," or "heroic 25s." By the 1990s, they were simply called 28 mm. figures, and have largely replaced 25s as the standard size for role-playing and many military games. Accessories scaled to match 28 mm gaming figures are generally built to 1:64 scale.
Read more about this topic: 1:64 Scale