Alexandre Gervais

Mon (紋), also monshō (紋章), mondokoro (紋所), and kamon (家紋), are Japanese heraldic symbols. Mon may refer to any symbol, while kamon and mondokoro refer specifically to family symbols. Mon serve roughly similar functions to badges, crests, and coats of arms in European heraldry. Mon can still be seen widely on stores and shops engaged in traditional crafts and specialities. They are favoured by sushi restaurants which often incorporate a mon into their logos, while mon designs can be seen on the ceramic roof tiles of older houses. Wikipedia