Abstract: The utility pertains to stationery, and relates to markers. The marker comprises a shank and a cap fitting over the shank, the front of the shank has a nib, the end of the shank has two grooves in its two sides, and one side of the cap has a fastener. The marker is cuboid according to the utility model, so it is easy to arrange. One or more caps of the markers of the utility model can be connected together to form a cuboid marker, which is stable and comfortable to hold. The markers also can be connected to pack away and carry.