Shichirin is a portable cylindrical grill that uses charcoal (preferably bichotan charcoal) as its fuel. It was invented since ancient times but it is still widely available in restaurants all over Japan and in many households to this day because it is compact, lightweight, efficient, and that the body of the grill does not turn too hot during use. Shichirin literally translates to 7 wheels. The number 7 (or shichi) comes from the fact that it took very little money – only 7 rin (a currency used in ancient Japan) – to cook a full meal for the whole family. While “rin” in shichirin translates directly to a round stove.